[Solved] Help building a gaming computer 1800-2000 dollers

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APPROXIMATE PURCHASE DATE: this week BUDGET RANGE: $1800-2000 After Rebates

SYSTEM USAGE FROM MOST TO LEAST IMPORTANT: gaming, encoding/physics processing applications,watching movies, surfing the internet
PARTS NOT REQUIRED: keyboard, mouse, monitor, speakers, OS
PREFERRED WEBSITE(S) FOR PARTS: newegg.com, ncix.com, any will due COUNTRY OF ORIGIN: (e.g.: United States)

PARTS PREFERENCES: by brand or type : Prefer intel i7 processor and an ATI graphics card

OVERCLOCKING: Definitely SLI OR CROSSFIRE:maybe, depends on cost effectivness

ADDITIONAL COMMENTS: I don't care about noise levels, and i have a good amount of experience in computer repair, just having trouble compiling a parts list. also i am planning a raid 0 setup with 4 250 gig hard drives
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So you want some redomended build or what. I'm not being sarcastic or anything I just wanna know A little more about what you are looking for.

Are you looking to go I7 920 or I7 860 sorry but I just need the specifics