If you buy a Mark V instead of a Mark IV, i will get on a train to slap some sense into you, cue
How about a Mark IIC+ over a Mark IV?
Anyway, what I seem to find with many of these amps is that the gain turns into fizz really quickly. I want any sort of 'chug' to be a punch in the face and something tells me it requires more gain stages and a bigger power amp to accommodate it.
Then again, I have no idea.