Looking for DAC suggestions

Hi All,

I'd like to update the quality of my digital side. I want to use the digital output from my NAD 502 and run it to a DAC, but am not sure what a good match for my system would be.
Pre: Sonic Frontiers SFL-2
Amp: Bryston 3BST (I sometimes use up my old Sonic Frontiers SFS-80 (no bi-amping))
Speakers: B&W 805 Nautilus

Any suggestions for $2000-$2500?

Thanks,
Foo