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!!!
mcgarrjr
Rega. It's one of the most musical and easy to listen to dacs I have yet heard in that price range. Listen to one if you can.
I agree on the Arcam rdac for sure. Its $500 and is a asynchronous. It has wireless options as well.