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.
Enjoy,
TIC