Remasterd editions don't necessarily mean better sound quality it's is possible the audio can actually be worse -- the only advise I can give is to buy the remasterd edition and compare them using a good pair of speakers.

Or, get a good record player (if you don't have one already) and buy the Japanese or German original vinyl edition. That'll make any CD-version sound like a 128kbps mp3 on $30 computer speakers. /Peo