I use the Mothers powerball when I can. Just make sure you have an impact drill, and turn it down as far as you can. That way, if the powerball gets hung up, then it stops spinning and doesn't shred the powerball.
As far as polish goes, I got a sample from a distributor here a while back. I can't remember the name of this stuff, but it works better than any other metal polish that I've ever used. I'll go out to the van here in a bit and get the name of the stuff.