My local GC has an M6 (probably the rackmount version) for $799 and a 4x10 (probably powerhouse standard) for $749. It looks like these are normally $1299 and $1099, respectively, so this is tempting. I currently play through a Markbass LMT800 and 104HF but I'm not completely satisfied with the tone, I think the Mesa might be more for me. I'll definitely take my bass into the store and check it out. This would seem to be a great deal but, do you think I could possibly negotiate the price further? Any thoughts on or comparisons between the two heads? If I do pull the trigger on this I'll have to trade in or sell the Markbass rig, and I'm guessing I'd lose quite a bit trading it in to GC.