i am a mesa guy myself but i am definetly about to pick one of these up for my studio. either a 5150I II or 6505...
Why not save some cash and get a 5150 instead of the 6505? It's the same amp.
5150 = 6505
5150II = 6505+
Same exact amplifiers, the 6505 is named that because of a contract-gone-bad between Peavey and EVH, so Peavey can't use 5150 anymore. Get a 5150 or 5150II on eBay, typically you will save a significant amount of dough by going that route instead of 6505/6505+ which are newer and can garner higher resale.
~e.a