Here some combos for new users, you can feel free to change everything you want, but the mobo...
You can check the HCL for better video, audio, wireless and everything you need add in the system.
http://wiki.osx86project.org/wiki/index.php/Main_Page
The processor doesnt matter, so you can always change it too ;P
Motherboard: Gigabyte GA-EP45-DS3, GA-P35C-DS3R, GA-X48-DS4, Asus P5Q Deluxe
Processor: Core 2 Quad Q9550
Video: nVidia 8800GT 512 mb
Memory: 4GB RAM DDR2
Hard Drive: 500GB 7200 rpm + 300 GB 10000 rpm
Power Supply 750/1000w
DVDRW Serial ATA
Mother Board:Intel DG31PR
Processor:Intel® Xeon® CPU X3220 @ 2.40GHz
Bus frequency:1.06 GHz
Memory: 4GB RAM DDR2
Video:Nvidia 8800GT 512 Mb
Hard Drive: WD 500 GB 7200rpm + 500 GB 7200rpm
Power Supply 1000w
DVDRW Serial ATA
And super cheap one
Motherboard: Gigabyte GA-G31M-ESL2
Processor: Core 2 Duo E2200
Video: Nvidia 7300 GS, 8600 GT
Memory: 2GB RAM DDR2
Hard Drive: 1x300GB 7200 rpm
Power Supply 350/450w
DVDRW Serial ATA
New one
Motherboard: Gigabyte GA-EX58-UD5 or MSI x58 Platinum or ASUS P6T Deluxe
Processor: Intel Core i7 920
Video: 9800 GTX
Hard Drive: 500GB 7200 rpm + 500 GB 7200 rpm
Memory: 6GB RAM DDR3
Power Supply 750/1000w
DVDRW Serial ATA
Hope it help
