Hi, I have been using Rotel Rb 1092 which you can purchase dicounted to 1499. I have several amps however this rotel really improved the sonic performance of the axioms.

I am using a moon P5.3 as the pre amp.

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