for now your better with the high end dual core athlons... or even better core 2s...
most games wont go much faster on 4 cores than 2 at the ame clockspeed and with the 9600 black edition not even garunteed to reach 2.4ghz, a 3.2 ghz dual core athlon will give better performance for games.
with phenom youve got the huge heat output and TLB issiue to contend with and you wont see great performance for games.
my advice is wait 'till theres TLB error free phenoms running at ~3ghz, thus providing as much single and dual threaded performance as the athlons and/or wait 'till most games can make good use of 4 cores... even better, switch to intel, the simple fact is that they offer far superior performance right now and im not a fanby, im running amd right now