Odds are I'll own both sooner or later, but I don't think I'll wait on PS3, especially considering Sony's track record of serious defects on their launch systems ... anyone remember how often people had PS2's with burned out lasers in the first year or so?
I had that problem with my first PS2. I had to send it out to get it fixed. I paid $120 to get it fixed but three months later, it started doing the same shit again. I just took it apart and cleaned it. Every few months or so I would have to that. I finally just gave up on that system when San Andreas wouldn't work and bought one of those slim ones.
Back on topic: I would buy an Xbox 360 for just Halo 3.