Jim,
If I were you, I'd wait and see when BH is going to release an upgrade kit for the s.e.x. 2.0 that uses the new s.e.x. 2.1/stereomour iron. These are really very nice transformers and I doubt most will want/need anything more than they can provide.
I'm kind in the same boat as I have a 2.0 that I'd like to do the iron upgrade to at some point.
HTH,
Jim
Jim Rebman -- recovering audiophile
Equitech balanced power; uRendu, USB processor -> Musette DAC -> 5670 tube buffer -> Finale Audio F138 FFX -> Cain and Cain Abbys near-field).
s.e.x. 2.1 under construction. Want list: Stereomour II
All ICs homemade (speaker and power next)