Great recommendations above. Haven't owned or heard a Tranquility (sadly), but I thought it was worth pointing out that it is limited to 16/44.1 (CD quality) output. Most other DACs here can do 24/96 or 24/192. The significance of this will depend on whether or no you will be playing hi-rez files. That said, the Tranquility also has a wonderful reputation, and I believe there is a trial period for these DACs. And ultimately, this will be about which DAC sounds best in your system, according to your audio/musical preferences.
DAC's, i'm lost
I recently purchased a pair of PSB Synchony two speakers along with an NAD 375BEE amp from my local dealer. My audio source is currently my laptop/an airport express. I'm looking for suggestions with DAC's. My budget is 500 and can be persuaded to spend no more than 1000. Please, help a newbie figure out what would work best!!!