What Power Supply Unit should I buy for my computer?

I'm in the process of building my own computer as well and we have pretty much the same parts list. I put my build into this website: a href="http://www.antec.outervision.com/" rel="nofollow"http://www.antec.outervision.com//a It was a few weeks ago that I figured out my power, but it was somewhere around 720 - 740 watts if I'm not mistaken could be wrong. I went with one over 800 watts so I have room to do minor upgrades in the future. Hope this helps