If you had to have an HDCD DAC which one ?

Any Wadia DAC will decode (recognize) HDCD because Wadia DAC's use software to convert digital data to an analog signal, as opposed to the "brick wall" or other Burr-Brown type chip found in most DAC's. And so the software processes any signal it "sees" -- in fact some folks (like me ;--) prefer the result from the Wadia better than an HDCD-capable DAC. (But you won't see "HDCD" on the Wadia display ;--)

The best HDCD enabled DAC is the Mark Levinson IMO, because they use their own custom DAC chip made for them under license from Pacific Microsonics/Microsoft. Plus, it's an excellent DAC.
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Pacific Microsonics HDCD 2

Regards,
Bruce

Bruce, is that a current product?

No sure isn't. You can find the occasionally on eBay. Make sure you get the Pacific HDCD 2 since it goes to 96k.

Regards,
Bruce