First Timer at this - My Computer Specs

[AngryAgent]

This is my first attempt at trying to build a custom computer. I've been wanting to do this for quite some time now. Especially since I just wanna throw this current computer im using in the garbage. I picked out the parts and I was hoping I could get some feedback.

CPU: AMD Athlon 64 X2 4200+ Socket AM2 BOX CPU - Windsor
Memory: US Modular 1024MB PC4200 DDR2 533MHz (I bought 2 of these)
PSU: Ultra 500W X-Finity Power Supply 120mm Fan / Black/ SLI/ SARA-Ready
D Drive: NEC ND-3550 Black 16x DVD Burner in Retail Box
HD: Seagate 320GB Serial ATA HD 7200/16MB/SATA-3G
MOBO: Gigabyte M55SLI-S4 Socket AM2 Motherboard
Case: Cooler Master Centurion 534 Blk Case
Video Card: XFX GeForce 7600 GS / 256MB GDDR2 / SLI / PCI Express / Dual DVI / HDTV / Video Card (Bought 2)

I didn't consider a Floppy Drive since I felt they were becoming more obsolete.
and I'll settle for the onboard sound.

[Alaron]

The two changes I would make are the motherboard and power supply. Asus motherboards are higher quality than Gigabyte. And most importantly, switch to this power supply: http://www.newegg.com/Product/Produc...82E16817104954 Ultra PSUs are junk.