Approximate Purchase Date: Preferably before 11/11/2011
Budget Range: ~$2500 seems like a reasonable target, but very flexible on this
System Usage from Most to Least Important: Gaming
Parts Not Required: Monitors, Keyboard, Mouse, Speakers, OS, Case, Sound card, SSDs/HDDs, Optical drives, PSU(=CORSAIR HX Series CMPSU-1000HX 1000W ATX12V 2.2 / EPS12V 2.91)
Preferred Website(s) for Parts: Any
Country of Origin: United States
Parts Preferences: Any
Overclocking: Any/Open (but I won't have any time to devote to this for next 6 months or so.)
SLI or Crossfire: Any/Open
Monitor Resolution: 5760x1080
Additional Comments: System must be capable of running all soon-to-be-released games (e.g., Skyrim, BF3, MW3, etc.) at all maximum graphics settings at ~60fps, 5760x1080 resolution and minimal microstuttering.
Basically your asking what processor and CPU to use, I can tell you that my 2 gtx 480's in SLI run BF3 well at 5760x1080, but not at everything ultra. The bottleneck ends up being the video ram on the card... Currently the best cards out for the setup you want would probably be the 2x gtx 580's but the 3gb versions, if you want to save a little go with 2x gtx 570's at 2.5 gb. Although you need a third to maintain 60fps.
Personally I'd get 3x gtx 570's.
Processor - 2500k or 2600k is fine, hyperthreading is meh for gaming, but whats another hundred dollars on a setup like this. Be careful what motherboard you get, as you need to get one that supports cards in TRI sli, and that support the card width. I know my ROG maximus iv supports tri sli, but I don't see how I can fit 3 cards with fans, but I use watercooling so the cards take up less space.
Oh yea, and overclocking... its super easy with the K series intel processers, you shouldn't need to mess with voltages on auto until you go past 4.5Ghz. keep in mind I think I heard new processors are coming out this month... but I could be wrong.