24 or 27 inch monitor?

You absolutely do not want to run 1440p on a 6850! The Dell U2410 is a really excellent monitor, but even better would be an ASUS PA248Q for much better pixel response without sacrificing image quality.

I just recently got a 2nd U2412M - and love the amount of desktop space I have, without going overboard for the amount of physical space they take up. I wouldn't be able to do dual 27" monitors, just too big.

I was reading a lot of materials about 24", and i found 2 monitors that i really can recommend for buying. I will buy one of them myself, in the nearest future: SAMSUNG S24A850DW or HP ZR2440W pluses and minuses for both of them:
1) HP ZR2440W

Pluses:

A rigorous body of practical frosted materials;
Excellent build quality;
High color rendering without adjustment;
Excellent results after calibration and profiling;
Good viewing angles;
High speed matrix (with the OverDrive) without appearance of by eye visible artifacts ;
Relatively low INPUT-lag (21.5 ms);
A very wide range of brightness (34-330 nits) while maintaining a high contrast ratio (~ 1100:1);
The high stability of color temperature with the default settings;
Having all of the most essential of modern digital interfaces (DVI-D, HDMI, DisplayPort);
Good kit;
Ergonomic bracket (tilt, turn, lifting);
Excellent management and organization of the menu (no useless picture modes)

Minuses:

Glow-effect when increasing the brightness of the black field and rapid loss of contrast at diagonal angles of view;
A very high price from the competition;
Simple pseudo eight bit matrix (six bits of A-FRC) with the corresponding gradients instead 8 bit that ZR24W had;
Relatively low uniformity of illumination (especially the average deviation from the center point);
The lower area is problematic when measuring the uniformity of color temperature.

May not satisfy:

The crystalline effect - it is still present (although for me it does not exist if you do not think it exists);
"Small" frequency of Pulse-width-modulation - can be seen only on video, in the future, perhaps, could affect the vision;
Compliance with the standard sRGB at 93.6%;
INPUT-lag (21.5 ms) - only if you're a mega-gamer;
Thick and heavy (everything is relative) body, despite the use of LED backlighting;
Lack of D-Sub connector - I do not consider it a minus for monitors with a resolution of 1920x1080\1200.

2) Samsung S24A850DW

Pluses:

An excellent alternative to IPS monitors;
Rigorous and slim body of frosted materials
Compliance with the standard sRGB color gamut for 94.8%;
The magnificent viewing angles;
Fast matrix without the appearance of artifacts;
A USB-hub with four ports of the third version;
A variety of interfaces to connect (D-Sub, DVI-D, Display Port, Audio-in, Audio-out);
The presence of a light sensor and presence sensor;
A wide range of brightness (70-349 nits) without reducing the contrast ratio (~ 900:1);
Cable-management;
Ability to mount VESA-compatible bracket in two ways;
Very low INPUT-lag - 3.2 ms on average;
Low heat and low power consumption;
Ergonomic bracket;
The lack of visible crystalline effect, PWM and color shift - save up our eyes and nerves;
Adequate competitive price.

Minuses:

Poor quality material in the main body sections;
Poor centering of the panel, backlash, swinging.
Very large bracket;
Slightly extended color gamut (more than most IPS);
Problems with the uniformity of illumination;
A large number of useless modes and other settings (Response Time, Gamma Mode).

May not satisfy:

Standard Glow-effect without the appearance of a blue-violet tint shown by IPS displays;
Not very convenient control (especially in low light)

Wow! That's a good write-up. Did you see these reviews?

http://www.tftcentral.co.uk/reviews/hp_zr2440w.htm

http://www.tftcentral.co.uk/reviews/samsung_s27a850d.htm

No i didn't. I used russian-speaking sources, cause I'm from Ukraine.
Hmm, there is review for 27" Samsung, he might differ a lot from he's smaller brother.
Still i wrote it for people, that want to read only conclusions, and i hope, i picked good monitors And this links are good for broader information and pictures!

I wouldn't have guessed that from your name :-D Good point about the size - I didn't notice that! TFT Central is one of my favourite sites, highly recommend it. They'll be reviewing the PA248Q I recommended soon.

I've read about that "dark horse", i can figure out such conclusions:

Pluses:
Rigorous design and high quality materials;
Comfortable and functional control;
Two user mode (User 1 and 2) configurable for fast switching;
Factory calibration (claimed figures are broadly consistent with the measured);
Correspondence the standard sRGB color gamut by 94.9% (in Standard mode and sRGB);
Stable and high 1100:1 contrast ratio ~;
A variety of interfaces to connect video sources and peripherals;
Supports USB 3.0 standard by the USB-hub with four outputs;
Fast matrix with the ability to adjust the acceleration (six steps);
The magnificent viewing angles;
Wide opportunities of ergonomics;
Compatible with VESA-mounting brackets;
The availability of PiP / PbP;
Great delivery set;
Decent uniformity of color temperature;
Function QuickFit, the usefulness of which can be a long debate;

Minuses:
High minimum brightness (~ 100 nits) to work in the dark with a standard contrast (to be reduced to about 800:1 - not a big deal);
The original color accuracy below some 23-inch e-IPS monitors;
Worsening picture modes as Scenery and Theater;
Witless and useless function of 6-axis Color Adjustment (if the producers were not able to properly adjust the mode sRGB, then how a simple user should do it without any devices to check the result);
heavy body as for LED monitor;
Problems with uniformity of illumination on a dark background - clearly visible large lightening areas with a predominance of weak parasitic hue (probably depends on the specimen).

May not satisfy:
Average INPUT-lag of 21.1 ms;
Pulse-width modulation frequency about 200 Hz;
Frosted matrix and related crystal effect;
The absence of a lining cables system;
Standard for IPS matrices Glow-effect without the appearance of a blue-violet hue.

I can place some images for it:

The speed of the matrix and the INPUT-lag



The viewing angles and Glow-effect

http://www.youtube.com/watch?feature=player_embedded&v=qupnVHYw_UA





uniformity of color temperature


uniform illumination of the monitor


on white background


diffrent exposure on black background



crystall effect


PWM
eight bands at shutter speeds of 1/25 seconds

Haha wow! I know who I'm gonna come to about monitor advice :-D What site are you using?

http://www.overclockers.ru/ this is the main one

those uniformity patches mean absolutely nothing because each individual display is different and has it's own "fingerprint", if you will.

for the absolute best image quality, you must have the display professionally calibrated with a spectrophotometer - whichever one the OP decides on

Hi - some food for thought: I look at user satisfaction when the
sample is high enough. Here's two being recommended and
how they fared (by users) at Newegg in the US.

The Dell U2412 - 90% of users (230 of 255) rated it 4 or 5 out of 5,
truly outstanding.

The Asus p248q - 62% of users (70 of 112) rated it 4 or 5 out of 5.

More concerning - 31 users(27%) rated it below average.

While the Asus is no doubt a worthy choice, there seems to be a
significant QC issues at a minimum.

Think twice.

it shows, that some panels have some troubles, and you need to check it, read more reviews and stuff like that.

I'm in two minds about this. What Dingo says is correct - unfortunately these panels don't all come off the production line the same. Also, these panels aren't even made by Dell or ASUS - all IPS panels are manufactured by LG and then sold to Dell, ASUS etc. So QC issues SHOULD affect all manufacturers equally. That being said, a lot of ASUS monitor reviews do seem to flag up uniformity problems. I'd say the Dell is a solid choice, though back in March of this year, lots of people were complaining about white balance issues on the Dell U2312HMs. I don't think that's Dell's fault because again, it's LG manufacturing these panels.

Tricky one though. Clearly QC standards in general in the industry are lacking. I'm willing to bet that if you bought an Eizo or a LaCie there's about 0% chance of getting even the tiniest defect. They probably thoroughly test all panels they buy. But that's one of the reasons they cost so much!

nah, even NECs panels that cost more than 1.5k$ have some defects.

That's why I didn't say NEC I have one at work and it's actually got quite a few defects! I wouldn't have accepted it personally, but my boss wasn't that bothered and he was paying.

I'm curious about your negative experiences with NEC though? My experiences have put me off them a bit but I assumed my work monitor was a rare exception.

I worked about a week in front of one PA241W, and the main disappointment for me was noise that 1000$ monitor was producing when brightness was blow 350 nit. It gave me headaches
And still, glow effect was present.

I was gonna say that's my work monitor too, though I think mine is an EA24... something. Pretty sure that it was not a $1000 model though What do you use now?

I was using an old HP ZR24w, but had to relocate, and gonna buy Samsung I mentioned before. My budget placed me up to this panel.

How did you find the HP for motion trails? It looks pretty good from the PixPerAn high-speed photos?

As any monitor it has some weak sides. This is one of them. Without OD he is not so fast. Switching it on nearly eliminates all the trails, still some artifacts appears, BUT you will find them only if you are looking for them, they are not so bad.

Yeah that's been my experience too. I've never seen a monitor where I can't see the trails if I look for them, but it's been a very long time since I've used a monitor where it was a real problem. Most monitors of the past three years seem amply responsive to me.