Preamps for Atma-Sphere OTL Amplifiers


I have a pair of M60 MKIII mono-OTL amps. I am currently using them with Atma-Spheres MP-3 pre. I'm looking for advice from people who are using preamps other than Atma-Sphere with Atma-Sphere amps.
fooolish1
Having used other fine preamps with the M60s, I would use an MP-3 with the upgrades - which I now use, or upgrade to the MP1 which I assume must be better yet, but I have only heard it at shows, not in my system. What are you looking for that you feel you are not getting with the MP-3?
I have a S30 (among many other amps) and pair it with a Shindo Vosne-Romanee. Pairing sounds wonderful to me.
I use passive preamps with my S-30 for single ended mode. I run an Otari MX-5050 BII direct into the S-30 for balanced mode.
Lately I've been using a YS Audio A2-SE with my S-30. It is virtually dead quiet in balanced operation. A strange, intriguing unit as it's still breaking in; will need to evaluate some more.