Need to know priority of upgrades for prebuilt PC

I would upgrade your Videocard but you don't need the newest cards since your monitor resolution is low. I would get a 24" LCD and a new VC.

i'd get a second 6850 and a nice 23" monitor.

There is a guy called azeem40,send him a PM he is the boss when it comes to monitors around here, i can help you with the insides of your PC only.

if i were you
monitor,
then add memory (optional, this is a low cost)
then SSD
then video card (will need to be bigger purchase to get a significant improvement, 6850 isn't thaat bad)

The HD6850 will probably have microstutter when Crossfired. That bothers some people more than others, but it isn't a chance I'd care to take, so I would not recommend that others take it.
Your PSU is sufficient for any single graphics card out there.
As far as what is "most needing an upgrade," what does not run as well as you would like? Your system looks pretty well balanced to me. It won't help FPS, but the overall feel of your PC would be dramatically improved by adding a SSD. I would recommend a non-Sandforce drive (e.g. a Samsung 830 or Corsair M4) of at least 120GB. If you do anything you really care about, get a second identical 500GB drive to run in RAID1 with the one you have. Consider something like an external 1TB-2TB drive for backups.
I hesitate to suggest what else you might improve without knowing what feels weak to you, however if you cannot play your games with graphical settings as high as you'd like, a HD7850 would be a substantial upgrade over what you have now. If you have some games that have PhysX effects you'd like to see, then a GTX560Ti or GTX570 would be nice choices. I'm reluctant to suggest a Kepler (i.e. GTX6xx) card because of the gimped compute performance. It may not matter today, but it might matter next month or next year; again it isn't a chance I'm willing to take myself, so I won't recommend it to others.

Hmmm i disagree with you, more RAM is not needed (although it will come in handy sometime) the SSD will only speed up launching/booting/loading/ times, it will not do anything for the frame rate.

A second 6850 on the other hand will be VERY usefull for gaming @1080p specially if you want to have the luxury of maxing out every game and turning up all the filters

That microstutter thing is Bull Sht i have 4 GTX 680s and i've NEVER experienced that, even in heavy games.

Thanks for all the nice feedback! I think I'll buy a new videocard, possibly some ram and a new SD (over a course of time). Does anyone have any suggestions for a card in the 250-400 dollar range? Preferably AMD. I could also go with aqualipt's idea, but I think I'd feel better with a brand new card as this one seems to have some issues (I won't go into detail).

GTX670 ≥7970>7950≥GTX660ti>7870>7850

Thanks! But would this work with my current PSU?

Yep!

Of course you haven't! And you probably wouldn't with only two of them either. Two much weaker HD6850s are another matter. Look up and read the past article on Tom's. I think Techpowerup did a good article too, going in depth on the timing of alternate frame rendering.

OP, if you're going to get a higher resolution monitor, get it, then see how much of a performance hit you take.
I'm not rich, but I'm able to meet my needs, and my wants are reasonable, so most of them too. Even getting a HD7870 for 1920x1080 was a little awkward for me, but I expect it will last for years. With HardOCP suggesting that a HD7970 was probably overkill for 1920x1080, I don't think you need to spend more than the cost of a HD7870 or HD7950 for plenty of longevity, especially if every possible setting doesn't have to be on UltraMaxOhWow! for you to enjoy your games.

A sound and balanced recommendation.

More great replies from everyone, thanks a bunch!

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