Check out Monarchy Audio. They have several models with volume controls. I'm not sure if the volume control is analog or digital though. New or used, they are in your price range.
DACs with volume controls
Okay, I love all this audiophile stuff, but I'm a private school teacher (little money). So are there any decent used or new DACs that I can purchase with a volume control and hence skip the need for the preamp? I'm thinking I can go 1.5 grand, maybe 2 if I wait till summer. Anyone out there use this stuff or heard it? I'm new to this sonic world and have only read about the Wavelength DAC, don't know any others.