Why are you buying an Nvidia board if you're not going to be running SLI? I swear by a P35, much better overclockers than the 750i: http://www.newegg.com/Product/Produc...82E16813130098
Is the Zalman version of the 8800 GT better than the normal one?
Yes! I used to have a reference XFX 8800GT, but the cooler was useless, 90c at load and quite noisy too. I was just going to replace it, but then I found out about the card in my sig. It has a sweet spiral cooler and a voltage jumper. I wrote a review here: http://www.computerforums.org/showthread.php?t=70301
My first attempts at overclocking the card weren't very succesful, but the voltage jumper fixed that (read on after the conclusion).
Don't get a reference design whatever you do.
I don't really think you need 8GB of RAM though, but make sure you get a kit with CAS 4 timings.