McCormack DNA with Schiit Preamp?

Hi - I have a McCormack DNA-1 deluxe amp and looking for a good preamp match. Very hard to find a McCormack RLD or similar but in reading on this forum, it appears having a good line drive step attenuator volume is key with this amp. So I was looking at the Schiit Audio Saga or Saga+ as it boasts a very accurate stepped attenuator. Plus you can use with it in either passive or active with the one tube engaged or not. 

Anyone tried this setup, or if not, could recommend a line stage preamp for my DNA?  Thanks in advance