Of the amps you have listed, with your existing preamp, the Ayer and BC make the most sense. The BC 8 is one of my favorite amps. Then the Pass and McCormack. The Sim is very accurate, maybe a little dry. Since the door was opened for digital amps, look at the Channel Island DM 200 (or the 100 if you do not need the power). It mates with the SE9 extremely well and will outperform most amps more expensive. It is musical and accurate without dryness or being analytical. It is a sleeper, clearly light years ahead of the Nuforce and others in its class.
But, it all comes down to your ears, room and overall tolerances.