I'm a bit surprised by your list as you want detail and musicality and some of your choices could disappoint you.
Audio-GD does great DACs in my opinion with more detail and musical flow then the RWA/ Lavry/Benchmark I have heard.
The Audio-GD Re5 and RE7 both have USB that can handle higher res files and then the DSP1 processor takes care of jitter.
Can you get to listen to different DACs before buying?
Ive heard the RE5 vs the Isabellina. The RE5 was so much better it was in a different class with that system. Its easy to choose when you can A-B and its not necessary to try and hear differences.
Edited by Nada - 7/4/10 at 8:19am