GT430 is pretty paltry if you wanted a computer that's somewhat future-proof.
http://www.tomshardware.com/reviews/...6850,2782.html
There are some good recommendations in that article.
Also, 350W is pretty small and if you wanted to upgrade the video card to something more powerful, you would need at least 500W depending on the card, I think. 800W is overkill unless you plan to use Crossfire/SLI.