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 used to run a Rowland Synergy 2i with 12 monos, it's one of the better preamplifiers out there, it's lush, clean, and fast. I have since replaced the Synergy with a Ayre K1x, everything seems to open up, sound expanded in all directions...more 3D soundstage. If you like the Synergy, you hould definitly audition the Ayre, you won't regret.
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.