Don't Do It! I just went down this path myself because I wanted to build a cheaper 'hack Pro' and it was an ****ing pain in the ass! Big time! Unless you want to spend countless hours searching forums and troubleshooting for basic things like sound Don't do it! Hackintosh's don't "just work" like a real mac does, in fact they're even more trouble than windows.
If you want to save money bite the bullet and get a pc and run windows. If you want to run mac osx take my advice and save your pennies a little longer and get a real mac. Trust me it's worth it! I ended up giving up on my hackintosh and selling it, I lost a lot of time and money in the process and If I had just waited a couple more months I could have easily bought the new i7 imac. I have a 2007 MBP and it works flawlessly. I upgraded the hard drive recently without a hitch. Something a simple as a software update on a hackintosh can crash your system and bring about hours and hours of pain trying to get the effing thing working again!
The whole point of buying a mac is the fact that you don't have to spend countless hours setting it up and configuring to get it working properly! A mac is one set of hardware designed to work properly with one operating system. As I learned from my experience a mac isn't just about the sum of it's parts, it's the whole!