Looking for some advice please

I am looking to purchase a new computer to play mainly MMO, RPG and some FPS games. I was hoping to keep the budget between $1500 - $2000.  Here is what I have come up with so far:

You could save a few bucks by going to a 620W power supply, though you dont really need that much either if you arnt gonna SLI, at least in my opinion.

Thank you for the replies.  I have a few questions:

I own a 750i case, and the stock cooling is rather sub par. With some modifications, I expect to be able to get the cooling to a sufficient level (I have effectively added stage 3 cooling on my own already and am still looking to improve), but there is a reason I selected the 850i in the configuration I posted. It's easier to just have good cooling out of the box than to have to go back and fix it after the fact. Your CPU is not the only thing that will benefit from additional air flow. That 8800GT will operate with a higher degree of stability as well.

Power supplies are not simply about how many watts they are rated for. Get a power supply that produces good, clean, stable power, and you will not regret the $30 extra spent. If you are going to use only one OS, I would stay with 32 bit. While you may not run into many compatibility issues, you have no way around the ones you do find. The 64 bit OS is better in many ways, unfortunately we still live in a 32 bit world.

If you are running only one video card, you will not have to worry about bottlenecking on any core2 processor running at 3GHz or beyond. Stage 3 cooling should get you in the neighborhood of 3 to 3.2 GHz with a GO stepping Q6600. It's extremely hard to beat the value that processor represents. Also, don't forget that when running games, the average home user tends to have more running in the background than a professional reviewer running a test bench setup. Keep this in mind when looking over benchmarks of the various CPU selections available. Having more cores does have advantages.