The DS3L will only support 4 SATA devices. With one disk and 2 opticals you are already close to the limit. I'd get a GA-P35-DS3R instead (it allows 8 devices).
The 750GB disk (WD7500AAKS) is faster than the 500GB.
I wouldn't buy a MB based on 650i these days, it's too old. Are you thinking of SLI, i.e. buying another 8800GT later? You have to decide now, because 8800GT SLI needs a more powerful PSU and a SLI-capable MB and a case with serious cooling.
Some high-quality PSUs that can handle even two 8800GT cards: PC Power & Cooling Silencer 610W, Corsair 620HX.
For a single card and no SLI plans: Corsair 520HX would be great, or Antec Earthwatts 500W.
Are you sure you need a DVD reader? Either ditch it or make it a burner. The price difference is negligible, it might as well be a burner. I don't like Sony. Samsung SH-S203B or Asus DRW-1814BLT are good burners.
About the 8800GT: it comes with a single-slot cooler, which is a bad idea IMO. There are quieter and cooler cards with similar performance and dual-slot coolers, like 8800 GTS G92 512 MB (a bit faster than the 8800GT) or HD 3870 (a bit slower than the 8800GT).
i wouldnt be using more than 4 satas so it`s useless for me, and im not gonna be sliing (not in the next 1~2 years) so p35 wins ,its just that it would cost some 30$ more than the 650i.and the dvd rom and rw are coming from my old pc and they are pata(stone age !!!) so i`m stuck with them
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