You can get the mac version (but if you got the PC version stick to it). You can run windows games (not all) on top of OSX using Cedega. If you want pure gaming , boot into XP.

Sims 2 works fine on my hackint0sh. The OSX version. Just minor fps decrease as opposed to the Windows version (maybe its because of the drivers). It will work fine its just that you need to buy the Mac version of it. The graphics card are quite good in it. Plus the beauty of Mac lies within the system. You are actually paying for the design and the superb system !