The 430W version will be fine.
I checked out the website, and while it looks nice, the prices did seem higher than normal for some parts. As long as you live in the US, it is pretty much unanimous that www.Newegg.com
is the leader for online computer hardware retailers. For example, here is your E6400
at Newegg. Don't worry about reliability, Newegg is by far the best. Some hardware reviewers consider that if Newegg does not have a product in stock, then it has not been released yet. :classic:
You already have a good list of parts, so you should try to find them on Newegg. Just two changes I wanted to suggest;
Try this motherboard. ASUS P5B-E.
And this memory. G.Skill 2 x 1GB DDR2-800 4-4-4-12.