Flavio, thanks for creating this thread. I too have been considering purchasing a CD transport to go along with my Bel Canto DAC 1.1. Hopefully, you'll get some informative responses.
Some of the units I've been looking into are the Theta Data Basic I and II, the Sonic Frontiers SFT-1, and PS Audio Lambda mkII. These are all discontinued units and can be bought at great discount. However, there is a thread in this forum that raises concerns over the reliability and accessibility to repair of the Lambda mkII's transport mechanism.
I've also considered getting integrated CD players such as the Anthem CD-1 6-disc changer and the Roksan Caspian, then using their digital outs. I have heard that these units are very good all-in-one players, so my Bel Canto might not make that much of a difference. But they're pretty cool looking units.
I hope this helps out.