i have now a desktop PC made of:
Mainboard Asus P5QL PRO
Processor Intel Pentium 4 Prescott 2.8GHz Processor
Videocard XFX 8600GT 256 MB xxx PCI-Express
Memory DDR 2 Dual Channel 1G 667 MHz
Monitor LG LCD 14 inch
for test today i put Mac OS X Snow Leopard on it, all good
network LAN(AttansicL1eEthernet.kext), sound(VoodooHDA),
3D video support for graphics(NVkush 256MB driver),
for install did use EmpireEFi 108 AMD2.
For a real system, i recomand you buy a Mac.