I have a really crappy Chinese power supply and I was thinking about upgrading. I have an inspiron 570 with a HP - P3017F3 PSU. I was thinking about upgrading to about 400 watts. I think I found some decent ones under 30 dollars. A friend of mine gave me a ATI Radeon 7700 and I've been unable to use it for months. Just wanted your guys' opinions. P.S. I live in the U.S and I was thinking about shopping via Amazon