What about the Rowland Continuum 500 integrated? You'd get the 501/PC1 plus the newer Concerto line stage in one chassis. I owned one and tried them driving MBL 111Es and the combo seemed to work fine. If you were to then you acquire an (SA)CD player you could shrink your system to two boxes. Alternately, you could simplify on the source side with a CD player with a built-in preamp section or volume control that you could then connect directly to your Rowland amps.
MBL speakers
I'm looking to simplify my setup and have currently MBL 116 with Rowlands Synergy 2i/501/PC1 monoblocks and MBL 1521/1511. If I were to keep the MBL 116 speakers can anyone recommend an integrated amp and one box player that would have similar quality to my setup. Please keep in mind that the speakers need to have quite a fair amount quality power to get the best. The Rowland have 500w and I had a Rowland Concentra II (150w) which really struggled to give its best. Thanks for looking!