I am now building my new computer system and I have a PSU already that I actually bought last year.

It's an Ultra Xfinity 500W PSU
http://www.ultraproducts.com/product...&productID=384

Do you think this will be powerful enough to run a new system with:

Core 2 Duo E6850
640MB 8800 GTS (GTO maybe) and possibly a 2nd one later for SLI
2 dvd drives
1 HDDs (500 GB) - adding a second one later

fans (1x 200mm & about 4x 120mm)