The Schiit Freya + is super solid for that price range. On Friday I will be receiving the Scihiit Kara to test run. It will be used in place of a Wyred 4 Sound Pre with the second level upgrade. Will be doing my own thunder dome. Whichever unit performs, the other goes.
One thing to keep in mind regarding the Schiit preamps is the input impedance is about 10k ohms. Be cautious of impedance mismatches.