Monitor Resolution: 1400x900 however I always game in windowed whenever possible.
Additional Comments: It'll be the first time I've made my own computer, however I've done alot of experimentation on outdated systems, and helped put together some on newer boards. I plan to keep this computer for about a 4-6 year duration, so I'd like to have customization as an option (not mandatory though). Thanks.
Two PCI-E slots, however I don't know if I can crossfire them. Is it better then the other?
It is PCI-E x16 and x4 so its no ideal but it will work I herd they have the 68xx really working good now for CF but you will still lose like 5fps cause of the x4 lane but you still will gain allot more. It the GPU that will hold you back down the road but honestly I would just get the one 6870 for today and worry about upgrading tomorrow down the road when maybe new games you want to play are running ti slow for you. The 6870 @ your res 1440x900 will run real fast cause the 6870 is really more at home on 1080p so your smaller res will leave power to spare. If you can I would try and invest in a proper x16 by x16 or x8 and x8 mobo if you want to ever CF that way you can rest assured you will not have problems with it.