Stay the hell away from AMD when it comes to gaming, my only advise.
YouTube - Broadcast Yourself.
(ive actually had a AMD Fireball(top of line in its day) CPU melt while playing SWG)
The only things that really improve gaming is CPU, Memory and Video Card/Monitor, just get the best you can get/afford. This stuff changes so frequently even it you got top of line in one month it wont be.
Also keep in mind 95% of games out there will not utilize dual or quad cores including eq2, but i would still recommend at least a dual core.