I put together my rig about 7 months ago. I am currently running i7-960 CPU with 2x5870s in crossfire. My setup is primarily used for gaming. I have read stuff around here about getting more out of the cards if I am operating at higher resolutions. I currently have a single U2410 monitor at 1920x1200. However, I have been considering the idea of selling it and getting a U2711 which would enable me to run at 2560x1440. I am looking to get the most out of my graphics cards as I can while still running games at max settings. Also, I'm not too keen on moving to multiple monitors because I do not like the gap between monitors while I'm gaming. Thanks for any input you may be able to provide! Since there may not be a clear-cut answer to this, I welcome any pros/cons that may be applicable.
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At 1920 x 1200 those HD 5870s should still be working quite hard. 2560 x 1440 would just make them work harder, and that if it were me, I wouldn't really notice that extra resolution size.
with 2x HD5870, i'm sure you'll be fine with a BIG monitor, like 2560x1440...