I run my digital cable box and a really cheap DVD into my Wadia 830 (modified by Great Northern Sound) using the Wadias digital input. I wouldnt consider it mid-fi at all nor was it cheap but it ROCKS. Ive A/B a few other players including cheap SACD players and nothing comes close. Forget about upsampling, but in truth you dont need it.
Everything is controlled through the Wadia remote.