Ditto on the 1090 in regards to balanced operation. However, I do own both the 1090 (for Paradigm Ref 100v4 mains) and a 1095 that runs everything else. While both of these Rotel amps share that "endless/effortless power" quality, have excellent soundstages and a nice neutral frequency response, the 1090 is noticeably smoother in my system and excells at bass control/response and a slightly more refined high-end compared to it's multi-channel brother (when driving the mains). So I would do that as a budget-friendly amplification upgrade, and focus on a better preamp as well. Or get a preamp first, and see where that leads you...
Best investment for upgrade a RB-1090 or MC300
I have B&W 802D's and I am trying to decide where to invest the rest of my upgrade budget to get the most bang for the buck. I am currently running them off an RMB-1095 with AQ OAK cables and a Rotel RSX-1056 Receiver. Any advice on whether I should invest the rest of my budget into a single higher quality dual channel amplifier (MC300 or even MC352/402) or stick with a cheaper RMB-1090 and focus on a better pre-amp with balanced outputs, interconnects and transport etc?