Best DAC for Mark lavinson Transport 37 ??

DACs have improved alot since the Levinson 36/37 combo was introduced. Fortunately, your transport is capable of really singing with a current generation DAC. Check out Bryston's BDA-1. I just recently purchased their CD player with the same dac built-in, and it really is phenomenal. I'm not sure about the price, but it should be comparable to match up with the 37.

I was really impressed with the Weiss Minerva at our Club's meeting. It really hung in there with my Playback Designs.

Best? Can't answer that but I am selling my modded ML No.37 & Electrocompaniet ECD-1 DAC right here on Audiogon. I loved the combination of the two. Sound was very open & dynamic.
Good luck!