Thanks!
I don't know what the non-linear thing is, but if it fixes the imbalance issue then I'd much rather have the Teac over the other Schiit. Also, the Teac has balanced pre-outs, and I've always wanted to try a balanced setup. Would the Teac's XLR pre-outs work in that configuration of connecting HE-400s straight to Teac via XLR and being properly driven? If not, I could still utilize the preamp for some desktop monitors, and/or buying a separate amp later if I want a balanced balanced headphone setup. If I had to guess, the preamps cannot drive headphones, otherwise why would people need balanced headphone amps...
Non-liner means that the volume pot does not increase in volume at a liner rate.
The XLR balanced output is to connect to a balanced amp that has L&R 3 pin XLR jacks like this:
http://www.audio-gd.com/Pro/Headphoneamp/NFB1AMP/NFB1AMP4.JPG