I have the Centrance DACmini and with only a few days use and not trying out any other make, may I dare suggest you try it. The frequency extension is great. What bass I had with my Tonian Labs TL-D1s (nice, but soft) now hits like a hammer with great resolution. I swear it seems like it added half an octave. The mids are wonderful as well as the highs. Images, at first, seem to form out in front of the speakers. The noise floor is so low as to seem subterranean. Sharp image outlines and a very black background. All that and it has a great class A headphone input.
It turns out that the CD transport was holding things back. I really didn't expect it to be this good. No add ons (Almarra, Pure Music) and a basic 16' Belkin USB cable ( which shouldn't work as well as it does). And all of this for $795. Some great reviews are due out soon. Wait and see. Or get one now. It will a week before one is made due to demand.
