Recommend upgrade DAC


Currently using Cambridge DAC Magic with SB Duet. Have no real complaints and could happily live with it. But, what would be a nice step up in a DAC for around $800-1000 used? Possibly with HDCD decoding?

Also, all CD's ripped to FLAC. Will ripped HDCD's be recognized by SB Duet and pass them on to DAC?
smholl
Wavelength Proton (uses USB to power the necessities)
Benchmark DAC1 (no USB for this model but they have DAC1 w/ USB with additional cost)
I don't need, or want a USB input. Squeezebox Duet connects to DAC using coax digital cable.