Hi, I'm getting ready to step up to a high-quality amp (currently have a Blues Jr and Peavey Classic), and am trying to hone in on best choices. I am close to settling on a Princeton. But with so much $$ at stake I want to consider all the options. So I want to check out a Mesa or two. My criteria is this: under $1,000 used, all tube, 1x12, 15-30w, good cleans and punch, versatile classic rock sound, suitable volume for rehearsal and small-venue gigs. There are quite a few different Mesa models available used locally and from the usual online sources. So my question is this: of all the many models out there, what should I really be looking for? (Aside: I played a Mesa once before, briefly, and had a really hard time getting it to sound right, but I understand that is common with these amps.) Thanks for any advice!