[Plextalk] Excellent or best microphone for the Plextalk Pocket?

Hi, Does anyone here have preferences for best stereo microphone to go with the Plextalk Pocket? I have two Sony ones, now quite old, but the ECM217 is quite good with the Plextalk. By best, I mean more powerful I think. (I'd like that because I have a hearing impairment, so i could hear it too on my earphones.)