I currently run a Genz Benz Shuttle 3.0 into an Avatar SB112 (8ohm faital 12"). I like the tone, actually LOVE the tone. That said at when I let a note ring (say holding a chord) when it is decaying near the point it shuts off I get some fuzz sound. Does not come out the direct out (so never makes it to FoH) but it's annoying. Pretty sure it's not the cab as i recently refinished and resealed everything up, so my bet is on the head. Of course they are out of buisness, and I would not even know where to start to get it serviced. It's also a pretty small head to run my cab(s) (I also have a Goliath I). To that end looking for something in the 500-600 range that is similar to the Genz . . . at least in it's transparency. I like the uncolored sound, and the fact when I move a knob a click I can hear the change in sound. My shortlist is GK mb500, tc bh550, hartke tx600. I am aware of the volume limitation on teh tx600, however don't expect to need to push amps. I generally use amp as stage monitor and if I need something more the sound engineer is beating the drummer up to play softer . . . Is there another amp I should be looking at?