I'm considering moving to a preamp/power amp setup and the above is what I'm considering. I like a thick defined sound that can sit on the verge of overdrive, if necessary. I currently run an Orange AD200 with a Fulltone Bassdrive Mosfet with the gain super low, essentially as HPF. The Noble has caught my ear because of the pillowy lows, the Arkham for its Ampeg-ish versatility, and the PF50 since it can run as both a preamp or a standalone amp for practices and duo gigs. Anyone with experience on all three?