well I play a lot of 7 string metal, (Nevermore, Dream theater etc) but I also play alot of shred stuff, like Greg Howe, Kotzen, Satch, Vinnie Moore etc.
I actually have the opportunity to grab a mint (basically brand new) single rectoverb with a boogie 2 X 12 cab for a great price, but I don't know if that would handle what I'm looking to do.
I've never had the opportunity to play thru a Mark IV (and I just can't go down to the store and try one because no one in Boston carries them, you have to special order it).
I currently am playing thru a JSX head and frankly I think I want the Mesa that sounds as least like the JSx as I can get. I like the JSX but why bother getting something that sounds similar?