The Camelot Uther is a great sounding DAC. You could also try the Odeon AG for less money than the Uther or you could get an Odeon Lite for even less. If you want to go really inexpensive, you could get a Monarchy 18, 22 or 33. The volume control is standard on the 33 and is available on some of the 22s and 18s.
I have used a Camelot Uther IV directly into amp for several years with very good results. I strongly recommend the IV with the anagram chip and upsampling. The Camelot does volume control in the analog stage through 100 steps so you can really dial in the volume. I am pretty sure it accepts coax and toslink cables. They are available from time to time on Agon for around $1500. Good Luck