PARTS PREFERENCES: Looking for a i7 920 build with a ASUS motherboard, full tower case, and 4870x2 graphics card.
OVERCLOCKING: Yes (First attempt at overclocking, would like to get it to 3.0 GHz or more on air cooling)
SLI OR CROSSFIRE: Yes, I am planning on having Quadfire in the future when card prices drop or there is a need. Need beefy power supply and compatible motherboard.
MONITOR RESOLUTION: 2048 x 1152 One of the main reasons why I am leaning towards the 4870x2, I want to play all games in native resolution.
ADDITIONAL COMMENTS: I am looking to use this for a while. Current computer(Dell XPS Gen 3) is 5 years old and still going strong. This will be my first complete scratch system build. I have tinkered around a lot with Dells and HPs finally making the step up to custom.
Why not just get one card to keep the heat down? What do you think of the GTX 280? It should be powerful enough to power your 27" display.
I have a similar build to what the original poster is trying to put together and I have a 28" monitor 1 gtx280 can not do the job on the most demanding games NOW, in 6 months it would be really struggling. I went with 2 260's in sli and am very happy with my setup. If any system can take the most advantage of crossfire / sli it's an i7. Though I think 2 x 4870x2's might be pushing it due to deminished returns of 3 way or 4 way crossfire / sli, a 4870x2 is perfect.
Change Heatsink to TRUE, V8, or Noctua. Swap Antec 1200 for CM HAF932 (MUCH MUCH MUCH BETTER). And I'd swap the ram for something faster for a build this caliber. Maybe DDR3 1866 or something, shouldn't cost too much more.