I lose no sleep, running unbalanced (RCA)-because of the quality of what I'm running through my whole Listening Room System.....and Speaker Cable. ............CSP3 kicks ass to ZMA!
{The low noise floor of my IC's lets me utilize the higher voltage output of my CSP3.....matching balanced output-(means) no distortion or noise. .....I can't complain}.
However, downstairs System is not the glory of Decware, so I will run my (new) Audio Research LS17 SE from her to Behemoth Amp via Balanced next week (vs. unbalanced) for some serious break-in, in the Big Rig, through to the Polk SRS SDA 1.2's.....and let you know. Upstream sources run in to the LS17 SE, unbalanced (RCA) obviously. I have 3 unbalanced and 2 balanced inputs on her.
To answer your question: If you go with the ZTPRE, go ALL balanced....I would....and send or drive my ZMA for the balanced inputs. My 2 cents.