Best OSx86 disro for my custom build

[ghall]

These are the specs for my machine:

2.66 Intel Core2Quad (overclocked to 3.0Ghz)
8GB RAM
Nvidia GeForce 9500GT
EVGA nForce mobo
EDIMAX EW-7128G IEEE 802.11b/g WiFi
Creative Sound Blaster X-Fi Xtreme
250GB IDE hard drive (also has a 500GB SATA drive used for Windows Vista, if that matters)

Can I install OSx86 on this machine, and if so what distro should I use?