Preamp to use with Rowland mono amps


Any suggestions on preamps the work well with Rowland amps? I am sold on the M201 or mono 12s. I am looking to change out my Bryston amp and preamp with Rowland amps and something to match my system. As always suggestions are very much appreciated. My system is:

B & Nautalis 802 speakers
Meridian 588 CD player
CAL CL-10 multi disk
Birdland Ag DAC
Audio Magic power conditioners
bryanhod
I have used to great effect, an Audio Research REF2 MK1 into my Rowland model 9T monos
I went with the Synergi IIi and love it. This is a great combination to any of the people thinking about a new amp/preamp selection.