Schiit Modi + Vali $220
Schiit Bifrost USB + Valhalla 2 $800
The usual suggestions.
I have a few of the boys over today. We are testing the 800's on the Valhalla 2 and HA-1. Everything fed from the NAD m51. The Val2 has only warmed up for about 30 minutes. Just plugged the 800's into for the first. And...very interesting.