Hey all, I'm now in the market for another amp. I'm think around 700 bucks seems like a decent price range. I currently am using a Hartke 3500 with the Tube pre and 2 hartke cabs a 4x10 and 1x15. I love the tube preamp, I use no solid state but want the power and eq and not spend 3000 on an all tube amp if you get me. I have looked and looked and narrowed it down to start looking at the head I posted in the topic title. I am gonna go try out these if I can find em before I buy, but I wanna know if anyone has any of these heads and pros and cons if any. Just off hand I'm leaning toward the genz-benz shuttle 6, then the GK hybrid, then the markbass, and bringing up the rear the SWR. Any thoughts?