Which distro should I use????

Hi
can anyone tell me please which distro is the best for my pc:

CPU intel quad Q8200
Ram 4gb
graphic card: ati radeon 3650hd

its an HP a6675, and im also looking for a good tutoria. coz im trying to install mac on my pc and i downloaded the kalyway guide i burned the iso file of the OS but it does not continue after the "Darwin x86 loading" message and it reboots continuosly.

thnx

Whats your mobo? Please post your full specs, no links

Motherboard: Gigabyte GA-EX58-UD5
Processor: Intel Core i7 920
Video: 9800 GTX
Hard Drive: 500GB 7200
Memory: 6GB RAM DDR3
Power Supply 750/1000w
DVDRW Serial ATA

Ive tries ipc 10.5.6 and it just reboots before loading. Is there anything I have to change in bios?

Thanks In Advance

You will need to install retail to get all cores working, there lots of guides around, check munkys to know the basic and you can check this one for your mobo, good luck