Building a rig ~800 pounds

It would help if you could fill out this:

Approximate Purchase Date: (e.g.: this week (the closer the better))

Budget Range: (e.g.: 600-800) Before / After Rebates

System Usage from Most to Least Important: (e.g.: Folding@Home, gaming, surfing the internet, watching movies)

Parts Not Required: (e.g.: keyboard, mouse, monitor, speakers, OS) **Include Power Supply Make & Model If Re-using**

Preferred Website(s) for Parts: (e.g.: newegg.com, ncix.com -- to show us selection & pricing)

Country: (e.g.: India) we need to know where these parts are being assembled

Parts Preferences: by brand or type (e.g.: I would like to use an AMD CPU & Biostar mobo with a 24" LCD and full tower case)

Overclocking: Yes / No / Maybe

SLI or Crossfire: Yes / No / Maybe

Monitor Resolution: (e.g.: 1024x768, 1280x1024, 1440x900, 1600x1200, 1680x1050, 1920x1080, 1920x1200)

Additional Comments: (e.g.: Need to have a window and lots of bling, I would like a quiet PC).

As it is i made a more what i'd consider a better build:

intel i5 2500k £162
https://www.aria.co.uk/SuperSpecials/Intel+Core+i5-2500...
Really no point in getting the 2600 as you won 't feel the benefits.

Gigabyte Z68APD3 £82
https://www.aria.co.uk/Products/Components/Motherboards...
You don't seem to bothered by bells and whistles so this solid board will suit you well.

8GB Corsair Vengeance 1600 £36
https://www.aria.co.uk/Products/Components/Memory/DDR3/...
Good solid RAM

ASUS GTX560 Ti 1GB £159
https://www.aria.co.uk/Products/Components/Graphics+Car...
Out of the 6950 and the 560 Ti i'd say the 560Ti is the better option as it is cheaper and provides comparatively performance, especially on 1 screen.

500GB HDD £70
https://www.aria.co.uk/Products/Components/Hard+Drives/...
Cheapest HDD i could find, with prices in stupid numbers atm i wouldn't spend more than it, where you found that Samsung drive i don't know.

XFX Core 750W £68
https://www.aria.co.uk/SuperSpecials/750W+XFX+Core+Edit...
A nice solid PSU built by seasonic

Bitfenix Shinobi £47
https://www.aria.co.uk/Products/Components/Cases/MIDI+T...
Decent case for a great price.

Dell U2312HM £186
https://www.aria.co.uk/SuperSpecials/23%22+Dell+UltraSh...
Some may call this mad overkill on a screen and i can see where they're coming from, BUT it's an IPS screen which will make your games and movies really look nicer, and is easier on the eyes than a TN panel. Now i know you have selected an IPS screen as well but it's response time isn't as good as the Dell, however having looked at the review of it here:
http://www.digitalversus.com/lcd-monitor/lg-flatron-ips...
I'm more impressed, so you could save money here and get the LG, but my inclination would be to stay with the Dell. Your choice.
Review for the Dell:
http://www.tftcentral.co.uk/reviews/dell_u2312hm.htm

No heatsink as you don't want to OC and you can get away with the stock.

This does put you £20 over with P+P and VAT: £818.22 But apart from the screen i really can't see where meaningful cuts can be made. It only is 2.5% over budget so not exactly terrible.

Do you plan on overclocking your CPU or GPU at all? Any plans of adding SLI/Xfire in the future?

If you're mostly going to be gaming on this machine I would drop down the 2600k to the 2500k as there is a fairly big price difference and the only performance difference is HyperThreading. You do not need HT for gaming, so I would drop down.

If I were you I would also get a more modern motherboard. Yours will work for this build, but getting a H67, P67, or Z68 will net you a little bit better stability and better features.

That Antec blocked shape thing should not be placed anywhere near a PC. Check out the Corsair enthusiast/gamer/builder series of PSU's, they're very dependable and quite cheap for what they offer.

Bump up to 8GB RAM, it's actually too much, but 4GB isn't enough IMO - and you can't use 6GB without having a motherboard that supports a triple channel kit.

I personally would spring for the 6970 if you want to go AMD, or go with the 570-580 if you don't mind nvidia. It will be a bit more expensive, but again will last much longer and yield better results.

You can drop the aftermarket cooler, if you aren't overclocking past 4.0 you wont need it, the stock one will be fine.

What is wrong with Antec PSU's?

I have never had any luck at all with Antec PSU's. I've tried 4 different models, all of which were either DOA or died within 6 months of installation. For me only Corsair, Thermaltake, and Rosewill will do the job. Perhaps it was all bad luck, but after 4 tries I give up - bad luck or not.

Nothing at all