Preamp matching for Krell FPB 250M and ML

I owned a pr of Krell FPB 250M (Monoblock) and a pair of Martin Logan SL3 and trying to look for the Preamp that would match for these. Anyone have any suggestions?
I've used the Audio Research LS25 MkII with good sucess.
I'll go with a Krell KRC-HR or KRC-2.