I have to say, if you're looking to build an AMD gaming rig and a Hackintosh, then you should consider one or the other but not both. AMD is just too much of a hassle to Hackintosh.
Think about it for a moment- all of us know that even with Intel, only certain motherboards and chipsets work, and pretty much exclusively select Gigabyte boards unless you want major hassles. So even the average picked-at-random Intel motherboard isn't going to make for a great Hackintosh, if it'll even work at all.
Now add the additional complication of that same problem, PLUS a completely different processor architecture. Only a select few AMD boards are going to be able to work, and then only with major hacks.
Then on top of it you've got the graphic card issue- a card that's great for Windows gaming (certainly if we're talking bleeding edge) may not work at all under OSx86.
If you're really serious about OSx86, you might want to approach it like this: what's your budget for your gaming rig? Someone here could likely take the same price range and spec you a decent Hackintosh build with the most cost-effective OSx86 compatible graphic/gaming option as well, and see how it stacks up.
I also gotta add- I build a lot of client systems, business and gaming machines. AMD hardware is a little cheaper, but only in a few select cases have I seen where it really does stack up to more bang per buck vs. Intel.
Almost every time one of my clients that want me to build task-specific machines for them have cheaped-out and went AMD to 'save a few bucks' it turns out a slightly more expensive Intel rig performed the task much better. (For example- video encoding. AMD processors look great on paper for this, but similar class Intel processors KILL them every time, sometimes by shocking amounts.) I know the AMD fans may disagree with me, but it's been my experience that you pretty much get what you pay for.