Something different for you to consider- not a 70's or 80's amp, but I would recommend a rebuilt Baldwin amp by Will Vincent. He goes by member name "Autospec" here on the Gon. I haven't seen any for sale lately by Will himself, but they come up from time to time in the classifieds. There's one for sale right now over on AA, but it's a "Super Baldwin" and he's asking $800.00. I know you can get a standard one for around your price range. Had one driving my Klipschorns for a while and they were a match made in heaven. That Baldwin amp held its own up against some very expensive amps I had.