I have been looking on ebay at some older marshall's from the 80's and have been taken in by them. Harmony Central says a few are good, and some are bad. I need enough distortion for prog metal without pedals and I need the amps under 700 bucks. ANY one with any input would help. THX.
sounds like a dual channel JCM800 would be good for you

Look at the JCM 800 models: