I am wondering if you ever considered making a balanced version of the isabellina. I realize it would probably need two isabellina dac boards in it to get a fullly balnced output which would raise the price significantly. There just isnt any really good nos dacs out there and the oversampling ones are only a handful. It seems to be a rising awareness about balanced setups and was curious if you are considering building one in the future.
My entire rig was balanced about 4 years ago (Ayre, Wadia, Vandersteen crossover, expensive ICs, bi-wired speakers, etc.). I was pretty convinced balanced was best at the time. Now I've gone minimalist with all RWA and single drivers with a sub. Isabella w/DAC, 30.2 straight power amp, Apple macbook w/usb, Anticable speaker wire.
I can't say that RWA is hands down winner in every aspect of sound, but I can say it is much more natural sounding, and more satisfying to listen to.
Kent