I can't see the one-box units you mentioned comparing to a really high quality dedicated transport. But then I'm no expert. I'd say the best deal on a true audiophile transport would be another one-box unit: the Sony SCD-777ES CD/SACD player. Used, they run, typically, $1300-1600. Check the original Stereophile review, where they reviewer praises the unit as a state-of-the-art transport, plus you get Redbook and SACD playback as a bonus.
Good luck and happy listening!
Good luck and happy listening!