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CPU: The Q9550 & Q9650 cpu run very hot. You should get an after market cooler instead of using the stock intel fan. Zalman and termalake make some nice ones.

MOTHERBOARD: i have the gigabyte motherboard your looking at and it works fine seems well built. I'm running a 45nm duo core in mine, but i'm sure it would handle the quad core with no problems.

GPU: go with a gtx285

RAM: go with atleast 8gig of 1066mhz ddr2. Watch out if you decide to buy ddr3 ram most lga775 socket mother boards don't support it. ddr3 is being used on the i7 boards.

HARD DRIVE: if your looking for speed for gaming read times, look at a 3gb/s sata solid state drive or a 10000 rpm sata 3gb/s drive.

POWER SUPPLY: If you only have 2 hard drives and a video card, a 800 watt will be plenty of power. I would go with one that has a modular design. That way you can remove the cables your not using, reducing the clutter inside the box. Be sure that any power supply you buy has the correct pci express plugs for you video card.