I just know that Zephyroth's Mac OS X 10.5.2 for AMD EFI-REV2 is the best for Amd systems.It works perfectly for me from the beginning.But looking to your system configuration,newer and more powerfull than mine,you could try the new Mac OS X 10.6.2 from Hazard's.Just my opinion(2 cents).

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System specs: Desktop PC,
Nvidia GeForce 210,1GB,GDDR3,PCI-E 16x gpu,
6GB Ram(4x2GB),DDR3,1333mhz,
Ubuntu 12.10 x86_64/Windows 8 Pro x64/Mountain Lion 10.8.2,
Intel Core i3 3.1Ghz, cpu,
Gigabyte H61MA-D3V motherboard.