If I was going to build another gaming machine, I would go with the hyperthreading Intel.
2 things kill those of us who are addicted to MMRPG's... lag, and lack of processor power.
With the HT processor, you can run 2 instances of even the most demanding game and not have any problems. You can't do that with a 64 bit AMD... (why run 2 instances of the same game? Buffbots FTW!)
We can do it my way, or we can do it my way while I yell. The choice is yours.