Im currently building a very similar CPU on Vista...
if you wanna use SLI, 780i is pretty much your best bet I guess, although its a bit expensive... you should OC its FSB to 450 so your e8400 can reach 4ghz and then you could buy some 2x2gb ddr2 1066mhz pc2-8500 such as OCZ Reaper or just some 800mhz and OC it
i dont think you would need 2 barracudas btw! unless u wanna RAID 1 those ...
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