i have used the rotel with my m80s using a simaudio pre amp and a yamaha preamp. both ways I really enjoyed the amp. I am using rotel 1092 amps currently and suggest the 15 series is just a tad more neutral. the preamp makes a huge difference however.

MoonW5.3's
MoonP7 Pre
Moon300D DAC
Marantz AV8003
HSUVTF3 MK3 Sub
Axiom LFR 1100
AxiomVP180