What I do is take ALL the sound packs ... find the sounds that I like the best from any of the packs and create my own custom pack on my harddrive.
Krusty ... are you running the stock AH sounds ? If so, there is no way that those sounds are any better than what these guys have put out. The AH stock engine sounds remind me of the old Briggs & Stratton on my dad's lawnmower we had when I was a kid.