Buildng Quad Core AMD, Suggestions?

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Here's the specs so far:

Mother Board: Asus M4A785TD-M EVO

Power Supply :1000w Coolmax

Video card :ATI Radeon 4200 HD

RAM : unknown (haven't bought any yet)

I want to install Snow Leopard on this machine, It is unfinihed though will update soon as parts come in!

Any .kext suggestions?