First pressings may be the best of the generics but I would suggest focusing on the imports for, generally speaking, the best sonics. Identifying first pressings is easiest with the aid of the Goldmine and Jerry Osborne's record price guide books. Pristine first pressings of desireable records usually bring the most money in the collectors market. Please understand though that collecting these types of records has little to do with audiophile playback. I find it amazing that some of the tackiest, worst music is valuable.