Hey all, I'm in the market for a new head to replace my TC Electronic RH450 and am looking for opinions from people who've played these heads in a band setting. I play a soapbar-equipped fretless Zon 90% of the time. I primarily play prog/black/doom metal (think Intronaut, Cynic, and Negura Bunget), rock/fusion stuff (Gordian Knot, The Aristocrats), and solo bass noodles with my loop pedal and ebow. I like to be able to get down and dirty but it's also very important that my amp be able to clean up for playing the solo stuff. My typical EQ has always been very low-mid centric and I have an aversion towards brittle, abrasive highs. This is what drew me to the RH450 in the first place. However, I don't feel like the RH450 can really reproduce B-string thunder in a metal band situation. My guitarist plays through a 100-watt Orange tube head and 4x12 Marshall cab, so I really need some firepower to punch through the mix, especially given that I would like to be able to do so while playing through an 8ohm Mesa PH212. The RH450 sounds awesome by myself, but loses the low end in high-volume situations. I've played the titular amps in store situations, where I haven't had the opportunity to really drive them hard. I also didn't have the opportunity to try them through my cab; I got to use a TC RS210, Berg AE212, and Aguilar SL112. Aguilar TH500: I really dug the fat low-mids and sweet highs. I'm concerned that it may not be quite powerful enough and may lack hi-fi versatility. Some of my favorite bassists sound great with Aguilar gear. GK MB Fusion 800: I have never liked the GK sound (highs were always too brittle to my ears) until I heard this amp. I'm a big fan of Bryan Beller and he had a pretty convincing write-up on the merits of the Fusion series. I've also heard that this thing is absurdly loud, which is nice. Genz-Benz Shuttlemax 9.2: Really nice and transparent; lots of power and versatility from the dual channels and parametric EQ. I'm concerned that the value of these units will plummet (as well as customer service) with the dissolution of Genz-Bez. Also worried that it might possibly not be able to compete in a stupidly loud metal situation. I've also been GASing after the Mesa Carbine M9 despite not having the opportunity to play through it. I'm attracted to the onboard compressor, footswitchable graphic EQ, and power/volume (although I know the unit has had a recent power downgrade due to overheating issues). Would also be nice to pair it with my Mesa cab, if only for the sake of appearances. However, I'm turned off by the cost and possible reliability issues. But mainly the cost. I'm looking to spend around $600 used, and while I would prefer a micro head, I'm open to more conventionally-sized amps as well. Footswitchable EQ or dual-channel capability is also a big plus for me. Utility for upright bass is a subsidiary concern, but it would be nice. Feel free to make any suggestions if you feel that I left something out. Thanks in advance for any advice. I know that I can only truly find out what's right for me by testing out gear in band setting with my bass and cab, but that isn't always the easiest thing to do in practice.