When my Crack isn't being fed by my vinyl rig I have a NuForce icon udac-2. I really like it. I did a write up on it on my blog if you care to check it out.
http://hasafraker.com/post/3810968801/nuforce-icon-udac-2
To me it sounds very good, and was quite affordable, it's sharp looking, small footprint. Really no complaints at all. I took it to work and let a couple of my buddies listen to it and they were impressed with it as well.