Yeah, but he isnt running monte carlo sims or video. This isnt a generalised PC discussion, he wants audio.
DAWs have been using 64 bit for a while, and sonar 7 and up and reaper at the very least have been making better use of the quads. 8G of ram wont do anyone (thats not running an obscene amount of VSTs) any good for a few years yet, 2 is enough, 4 is enough to make certain.
A fast quad with 4 gig of fast ram and 2 fast hard drives and a sturdy and unfussy MOBO is the general format for a modern audio PC with a dose of future-proofing thrown in.