first build attempt

Hello everyone...pretty soon I am going to attempt to build my own pc... here are the list of components I am getting...it is going to be mostly for gaming...not really planning on oc'cing, budget is like 1500.

processor: Intel Quad Q6600 2.4GHz http://www.newegg.com/Product/Prod [...] 6819115017
motherboard: I am really not too sure...I want to do SLI eventually so I was planning to get a 680i board...but I am not too sure on which one...if anyone has a suggestion that would be great.
gpu: GeForce 8800 GT http://www.newegg.com/Product/Prod [...] 6814130306
hard drive: WD Raptor 150gb http://www.newegg.com/Product/Prod [...] 6822136012
case: Thermaltake Armor http://www.newegg.com/Product/Prod [...] 6811133154
power supply: PC Power and Cooling 750w Silencer http://www.newegg.com/Product/Prod [...] 6817703009
ram: This is another one I am not too sure about...I will either get 2 or 4 gigs of something lol
dvd: Not sure but Im not really worried about this.
os: Im thinking Vista 64, but I hear mixed reviews about it...is 32 bit better?

So how does this build look? Any comments or suggestions would be greatly appreciated. Thanks in advance!

Im presently running vista 64 and i can tell you that its working great, all you have to do is to make sure
that you got all 64bits driver
for the ram go 4 gig only if you go with 64bits os
32bits os will only show you 3. ... something gig with 4 install
Im not a fan of raptor, they are pretty noisy but depend on if a noisy tower dont bother you at all

gt8800 are great card

Good luck with your build