We have the CS6es and after auditioning most of the usual suspects; ARC VT-200 (great mids misses on the details), the new ARC M150 SS (very nice all around and can be multi-channeled), Classe CA-201 (nice mids but really loses detail during complicated passages - I sold mine since), the 300 watt Krell (don't remember the model, great bass could be a little more musical) and finally our choice the BAT VK-6200 which does everything very well and gives up nothing. It runs unbelievably cool and just plain kicks butt. It's not cheap but neither were your speakers. If you're familiar with their tube amps the sound of the VK-6200 is not very different. Take you time and check them all out - just don't skimp.
Kevin
Kevin