I think the Reference 8 amps will have enough power to drive the Gallos in your size room. That said, I own both the Ref 8s and Ref 9s and the Ref 9s are fuller in the lower registers and provide more bass impact (regardless of speaker sensitivity).
I'm driving the Ref 9s with a Benchmark DAC1 through a unity-gain, passive-buffered (solid-state) preamp with fantastic results.
In another system with the Reference 8s I'm using a Monarchy Audio M24 tube DAC (with built-in tube linestage) directly into the Reference 8s with excellent results (great bass too).
I have a friend who swears by NuForce's own P-8 preamp, which is supposed to be very good, although I haven't tried it myself. The selection of the preamp depends on your own taste and listening biases, but great results can be achieved via different routes.
I'm driving the Ref 9s with a Benchmark DAC1 through a unity-gain, passive-buffered (solid-state) preamp with fantastic results.
In another system with the Reference 8s I'm using a Monarchy Audio M24 tube DAC (with built-in tube linestage) directly into the Reference 8s with excellent results (great bass too).
I have a friend who swears by NuForce's own P-8 preamp, which is supposed to be very good, although I haven't tried it myself. The selection of the preamp depends on your own taste and listening biases, but great results can be achieved via different routes.