Thinking of buying a used one. I see a couple used rotel 1066's and some older lexicon dc-1 and mc-1 for $1000 and up. I want a better sound with DD and DTS and really don't need DPL2 and 7.1. I prefer stuff like adjustable crossovers and "tweakability" What are some good sounding pre/pro's? I got a sr-7000 at this time.