Hello, I have got an Dell XPS 400 with 3 GB or RAM, and A Pentium D Processor 2.80GHz and an nVidia GeForce 7900GS. I'm upgrading in December to an XFX ATI Radeon HD4670 graphics card and i'm looking at a few Power Supplies. Can anyone help me choose a power supply that wont break the bank and is at least 500W that will fit my case? Thank you very much.