You can go with an angle grinder, get an adapter from Caswell to get more RPM's and more torque to make it a bit easier.
http://www.caswellplating.com/buffs/index.html
It's up to you as how much polishing you'll be doing and what king of money you are willing to spend. Pickleboy, Mpierich and the others can give you any details you want and I'll help what I can.
SS