Hey all, I have been looking for a Marshall type amp and ive run into an opportunity to buy a JTM45 RI head. I was thinking the sag and feel is something I like, but wanted specifics about where on the volumes I would expect it to start to break up. I have owned a DSL50 and back in the day assorted other Marshalls. Wondering just how loud this amp is if using inefficient speakers? All info appreciated. Also, is 1200 clams a fair price for one of these in used (gigged) condition?