If anyone wants alternatives to both, I would suggest a passive buffer from Pass Labs and his Firstwatt F5. If you want to keep within the older Exposure house sound I would try a Primare A30.1 which has a VERY similar sound but dual mono balanced with two balanced inputs. I sold my 2010s because I wanted more texture and tonality and I also sold the Primare because the soundstage wasn't that much better than the Exposure XVII & XVIII.
This thread is old but maybe someone will get this when searching through Google.