Yup the schiit gear is awesome! I am going to see how the t90 sounds out of my onkyo receiver, it is a little bit dark sounding so hopefully it will do for a while. At least till my wallet recovers lol. I got out the headfi game for about a year after selling everything but my zik and k550, been back for a few months and I went a little crazy(th-x00, he-350, re-00 all arriving around august)
I think you will like the T90. If you're worried about brightness, matching them with your darker sounding receiver may be an excellent combo. Folks around here should have a bunch of DAC and amp ideas for you as well. I really like the T90 paired with the iFi Micro iDSD or the CEntrance HiFi M8.