Awesome article at LifeHacker on How to Build a Hackintosh with Snow Leopard, Start to Finish, including hardware, partitioning, etc etc. Might be time to upgrade for a bit less than Apple charges for their insane hardware :)

The only danger of course, is some random update somewhere down the road will render your nice $800 Hackintosh rig a brick. Course, at that point you can just install Windows 7 on it!