I will be honest, I know very very little about Mac hardware. But I would have thought that any hard drive would have sufficed.
Having said that, why not just search on eBay or possibly Amazon.
OS: Windows 7 64-bit Case: Commander MS-I
Mother Board: GA-880GM-UD2H CPU: AMD PhenomII X4 965 3.4GHz(Stock) RAM: 16GB GPU: GeForce GTX 550 Ti