900$ for CPU, GPU, Motherboard

Thanks for all your help.


APPROXIMATE PURCHASE DATE: completed by summer 2010

BUDGET RANGE: 900 for GPU, CPU and motherboard

SYSTEM USAGE FROM MOST TO LEAST IMPORTANT: Games [crysis, L4d2, America's Army], Video Editing, Longlasting [last for 3-4 years]

WEBSITE(S) FOR PARTS: Newegg

PARTS PREFERENCES: by brand or type (e.g.: I would like to use an AMD CPU & Biostar mobo with a 24" LCD and full tower case)

OVERCLOCKING: Maybe [have never done it before]
SLI OR CROSSFIRE: No [have had bad experiences]

MONITOR RESOLUTION: 1440x900, maybe upgrading monitor

ADDITIONAL COMMENTS:

I already own the Case, PSU and harddrive. The PSU is 750 watts and the case is a coolmaster and it is massive.

I will have windows 7 on it

The motherboard should have multiple usb ports, a firewire port and a esata port on it. USB 3.0 would be a plus.

I want to have atleast a 3.0 ghz quad core processor.

I want this computer to last for 3-4 years, as I will not be buying a new one until then.