What AV amplifier for 4 x b&W + centre

like your post. I was so much impressed with the sound and the amp I did not even notice the ore amp it was used in the set up.   
I am using my Arcam 850 s a processor and very happy with the quality for both the TV and music 

I was told Classe due to launch the new processor   Is it true ? 
My system is only 5.1 so maybe I do not need the latest technology    It has to support 4K though 

thank you all for helping me to get where I am at now !!!!

Tom, your on to it with your suggestion of separate multi-ch power amp to bi-amp L&R speakers and use your Arcam for other speakers.
For now, if you Arcam is a 7.2 avr and allows bi-amping L&R speakers you'll notice a step up in sound w/o investing any money for now. I use a Yamaha 140 wpc 7.2 amp and I'm able to allocate 2 rear surround channels to the front L&R for bi-amping and noticed improved sound from front speakers.

Oops! I just read all the posts instead of skipping half of them, so disregard my previous post. I see you made a really nice choice. Classe/ B&W is a classic combination. Hopefully my previous post will be of use to someone sometime.