first of all, if your really going to do gun work, you will need several vises. the versa vise is available from several places (google it) and is really handy, but not made to do "heavy" stuff, bbl work, etc. any GOOD bench vise will work, just get soft jaw pads for it.
wow, that's like "what's the best rifle round", the BEST copper cleaner is the one that works best for YOU; how often you clean, how you clean, what results your happy with, etc. i think ALL the cleaners work, just some work better for your particular regiment/methods.