$1200 i7 Gaming PC

APPROXIMATE PURCHASE DATE: Next week

UDGET RANGE: Around $1200 US

SYSTEM USAGE FROM MOST TO LEAST IMPORTANT: Gaming

PARTS NOT REQUIRED: keyboard, mouse, monitor, speakers

PREFERRED WEBSITE(S) FOR PARTS: newegg, amazon or whatever has the best price

COUNTRY OF ORIGIN: US

PARTS PREFERENCES: I have my heart set on a i7 920 CPU, as far as the GPU I'm thinking a Radeon HD 58XX, so here's

my first question, is the $100 + price difference between the 5850 and the 5870 worth it?

OVERCLOCKING: Maybe, but nothing extreme

SLI OR CROSSFIRE: Probably, but later

MONITOR RESOLUTION: 1680 x 1050

ADDITIONAL COMMENTS: -Will be running Windows 7 64, so i would like 6gb of ram.

-Need help with choosing the right PSU for the two 58XX.

-I want to get a 22" 1680 x 1050 monitor (outside of the $1200 budget) any suggestions?

-Any suggestions on the case? I'm not looking for anything flashy, but i would like it to have a couple

of fans, and to be able to fit the two GPU cards without any problems

Thanks for all your help & advice.