Which computer power supply?

keep in mind a cheap power supply does not put out the full power rated those rating are usually based on a lower temperature, and thus unrealistic conditions, so they will fail ealry a good power supply will produce peak power at the highest temperature i use only pacific power and cooling ( PPC ) power supplies in all my builds, they are quite run cool and have none of the modular ports that other PS have  more

You probably dont need the the 1000 watt one, but make sure it is SLI capable. I think the 700 one would be fine. Also try getting a cpu case and power supply combo from www.pricewatch.com or something. If you dont then make sure the power supply can fit in the case.  more