PC Power and Cooling is the top of the line for Power Supplies.
The calculator on newegg is great. I'm glad someone mentioned that.
Really any reputable company is fine. Suggestions are Antec, PC Power and Cooling, Silverstone, Thermaltake, OCZ, and even Corsair makes some. PC Power and Cooling won't let you down ever though.
http://pcpower.com
Some companies I would stay away from are Ultra, Raidmax, Apevia (aka Aspire), and Powmax. Although they are name brands I have had trouble with more than one power supply from each brand. These are usually found in low end computers. The Ultra high end PSUs have awesome features and such, but when it comes to consistent power I think they are lacking.
Also, the 300GB Raptor drives are out now. You might want to look at those. Two single platter drives from Western Digital (has AA in the model number) in a RAID 0 array can keep up with the 150GB Raptors and at a much lower cost. So far nothing can touch the 300GB Raptor drives.
Also, Pioneer is a great brand for optical drives, but if you are building a super system like this you should be looking at Plextor drives. Nothing beats the speeds and burn times of those.
Good choice on the video card.
The RAM is good, but if you are going to spend that much already on the Ballistix you might as well go with the Corsair Dominator series. Better performance for the money. The Ballistix are a bit overpriced. Thats not to say the Dominators are not expensive, but they deliver on all that money you spending I think better than the orange (yellow?) monsters.
Oh and btw don't go with the Q6600 for the cpu. The Q9300 is out and is only $40 more. Its whips the butt of the Q6600. Also, it will prolly sink in price really soon so theres no reason not to go with the Q9300.