Suggestions for a DAC

I'm thinking about using my meridian 506.24 as a transport & moving to a separate DAC. Would like to stay under about $600 (used).

Anyone got suggestions? or bruises from their experience?

Rest of the signal path is: ARC LS-7; SMC Audio DNA 0.5 Rev. A, Dunlavey SC-3, MIT cables throughout.

Thanks for putting in your 0.02.

brent