DAC Help

Bel Canto 1.1 or maybe Musical Fidelity? Then there is this Benchmark thing which is out of the price range for now but I could wait. Maybe there is something I haven't considered. I'm looking for a DAC for around $600 used +/- to go with a Theta Data Universal transport, Hamonic Tech Plantinum cable, and tube gear. I listen to Progressive Rock mostly.

Any suggestions would be appreciated.

Thanks -
Matthew