thanks i read the article def going nvidia and a gtx680
next question is what kinds of fps am i going to get with 3 screens
thats my main concern with the setup
The first question I would ask is, are going to go SLI or just a single card?
The 680 GTX is the first single core GPU that can handle Surround, so there very little information in regards to performance with multi-monitor currently. The biggest problem your going to run into with games at say 5760x1080 would be related to memory. There are not very many games that max out vram, but when it does it will cause sudden dips in your FPS and can cause a game crash, such as BF3 with Ultra and AA enabled. I currently have 2 580 GTX in SLI from EVGA that are water cooled so they are overclocked out of the box and I've been able to run almost any game maxed out, but there are games that I have to disable AA, such as BF3 and Skyrim. In the case of Skyrim though, I run ENB video filter and Skyrim HD along with many other mods to enhance the visuals. I would say I get 45+ FPS in Skyrim and BF3 on a 64 player map I get about 42+ FPS. These numbers are with SLI so a single GPU might be half or worse with my settings, thus you would have to sacrifice some or a lot of fidelity to get smooth FPS.
I would personally recommend you grab two 680's and put them in SLI or you could go with a single 690, that should be on shelves soon. The 690 has the potential to reach the max auto-clock of two 680's in SLI but I say if you want the most FPS with maxed settings, go with the two 680's. The only concern I see with your rig if you do get 2 680's or the 690 is that your PSU is lacking a bit, the recommend bare min I think is 850 to 900w.
EDIT: As far as monitors go, check Amazon or Newegg for you're price range. I found my Viewsonic's for $183 there, but I put them on a stand (same as the one sold here) which I recommend because the base is diamond shaped and it likes to wobble.