We've looked at how to find the right parts for a hackintosh on your own, but now hackintosh expert tonymacx86 has posted a comprehensive list of builds and parts for creating Intel-based machines of all kinds. It includes a quite a few sample builds as well as a very helpful, long list of compatible graphics cards.
Tonymacx86 is who we look to when we build our hackintoshes. In fact, we've built the CustoMac Mini posted on this list. That's the most inexpensive machine the build list offers, coming in at just a little over $US300.
You can work your way up to somewhat more powerful budget builds, or take on one of the pro builds for an extremely powerful hackintosh. All the builds are tested, but if you want to make little changes like choosing a different case or the amount of RAM you can do so without worry. If you want to make a bigger change, such as using a different motherboard or GPU, you're taking a bigger risk because so few are fully compatible. Fortunately, along with this buyer's guide, tonymacx86 has posted a long list of alternative motherboards and graphics cards so you can alter the suggested builds to suit you best.
The guide is very comprehensive and the builds are tested, so if you're looking to build a hackintosh any time soon this is an excellent list to consult.
Building a Sandy Bridge CustoMac: Buyer's Guide [Tonymacx86 Blog]