Opinions on lower priced digital that can compete

With the high end or maybe even enter into the range of "giant killer", if such a thing exists. Has to be coax, looking for something that does not add any character of its own to the mix. Should not be either light or full in any part of the frequency range. Should not be extra zingy or slow. Shouldn't push the soundstage further forward or further back, yada yada yada.

In the "budget" range I've been getting info on

Stereovox XV2
Cardas Neutral Ref
Signal Silver Digital
Apogee Wyde-Eye
Zu Cable

Don't know if there are any others in this ballpark worth considering, and having the (non) characteristics I'm looking for.