you honestly can get away with an Antec Earthwats 430W. Less than $75 and it powers my rig fine. I've used them in quad and dual systems with the same vid card with no issue.

I'd get the Muskin 4gb kit for about $70 instead.

And most of your links are broken.

What are you looking to do with it?

Cause I could spec you out a system that's 90% of the performance of that one but much less the cost.