Budrew- If your goal is to run your transport directly into
the amp, the are two choices- the new Spectron MIII and TacT S or M2150. I've had both the older Spectron MII and TacT M2150 in my system. The Spectron MII has enough power
to drive just about anything out there and is very smooth
with excellent control. The TacT has alot less power(150 vs 500),but a bit more ability to present inner details. Not having heard the MIII, I don't how it's digital and analog inputs will compare to the TacT's. The Spectral gets a little bit warm to the touch(nothing compared to a regular amp), the TacT can be left on or run hard and barely gets warm(like you no AC; heat reduction was one of the main reason I tried these amps).
With your speakers the TacT should more than enough power,plus you can eliminate your preamp and the DAC. If you're interested check out the TacT forum-http://groups.yahoo.com/group/TacTAudioUsersGroup/. There's
also a reviews of both amp on StereoTimes.com.