I have been using a Breuer 8C MK II for a few months now, and it replaced a Schroder DPS with Ref magnets.
For me the Breuer has been the best arm I have ever owned. I have had many through my place too!
To answer your question, I am using the Dynavector XV-1s and love the sound it gives me. Friends with the same arm, have used the Miyabi Standard, Lyra Titan i, VanDenHul Colibri custom for Breuer, and finally a new one that Thomas of TW Acustics has been enjoying a lot, is the Allaerts cartridges.
The Breuer 8c MKII has a two piece counterweight so it can accomidate carts that are over 12 grams now. But it will not balance my 9 gram Miyabi/47. SO the are is still a little picky as to what it will work with. But the counterweight is an easy fix.