I use a Benz M2 (0.8mV) and have found the K&K step-up that uses Lundahl transformers to be a good match. These come in kit form but for a nominal fee Kevin Carter will build them for you. You can also have the output cables hardwired (I chose this) and while the step-up ratio and gain is set at the time of order (14db, 20db, or 26db), it can be changed later if you can solder or know someone who else who can as Kevin provides the schematic for each gain level. I have been using this step-up with a Hagerman Trumpet and have been pleased with the sound.
While I do not know if these are compatible with Benz, I have heard very positive things about them: Bent Audio, Steven & Billings, Tribute, Audio Note, and if you can find one used, Cotter. Some of these come ready to use and others require you to build the casings, etc.
As Dougdeacon mentioned you'll be in for a variety of opinions here. Wait, what's that I here, bunker down I think I here Raul coming.
While I do not know if these are compatible with Benz, I have heard very positive things about them: Bent Audio, Steven & Billings, Tribute, Audio Note, and if you can find one used, Cotter. Some of these come ready to use and others require you to build the casings, etc.
As Dougdeacon mentioned you'll be in for a variety of opinions here. Wait, what's that I here, bunker down I think I here Raul coming.