Your Benz MC20E was designed to run through a MM stage. Most high-output MC's work better that way. A typical MM stage will be set up for 47K ohm loading and a MC cartridge that calls for that loading will work well.
If you are going to the trouble of getting a MC phono stage make sure that it is adjustable for gain and loading so that you can match whatever cartridge you decide to try.
If you are going to the trouble of getting a MC phono stage make sure that it is adjustable for gain and loading so that you can match whatever cartridge you decide to try.