An Ayre Codex would be a good place to start. It's not that expensive, and can deliver high end sound. Since you already have a good system and know what you're doing, getting a cheap dac is the equivalent to getting an entry level CD player. It will sound OK, but if you're used to something better, you'll want to upgrade right away.
lap top tunes
I have not been on the audio highway for a very long time. Is there a way to play the tunes from my LT to my rig and not lose audio quality?