Preface: I decided to build a new PC, since the last time I upgraded was 2 years ago. I ended up getting the Asus A8N5X motherboard, an AMD Athlon 64 X2 3800+ CPU, and the ATI Radeon X1900XT video card, and a new Hiper Type-R 580W Modular Power Supply.
I wanted a case that was fairly light...