I am in the process of getting a little recording set up on my macbook, and intend on buying either a 57 or 57a as an all round microphone for recording amps and such. it will mostly be used for recording distorted guitar, some clean, some acoustic, and vocals (not ideal i know but only for the sake of knocking together a few demos) if need be. Will be used on both deep and high voices. They both have thier own unique qualities, but i was wondering if anyone with good experiance with both of these microphones could tell me which would be best for my purposes? Thanks.