Thump, I've owned the Acurus RL-11 and I presently own the ACD-11 CD player that is used as a transport presently. It's nice to assume that if you purchase all of the same brand that you should have some magical synergy but in my experience that is not the case most of the time. Anyway, based on the rest of your equipment I would recommend the B&K EX4420 power amp. It has a very dark tonal quality about itself and would help to offset the high tonal quality that the Acurus line of products tend to have. What cables are you using by the way?
