I agree with Nreenter; please let us know what you are trying to fix above. I do not know anything about the Denon equipment you reference above. Have you listened to Krell in both CAST and non-CAST configurations? Do you like/know the sound? FWIW, I would not suggest the Krell mono's mixing in with the Classe 5-channel and the SSP800. If you like Krell sound, I'd suggest listening to an all Krell system (both Evolution and previous generation) and be sure you hear it in CAST as well as non-CAST modes so you'll know what it sounds like in a homogeneous as well as heterogeneous system.
Having owned an SSP600 and been VERY happy with it, I'd say you are on a great track with either an SSP600 or its successor the SSP800 and that you should listen to an all-Classe system with your B&W speakers. Specifically, if you want to have mono-blocks on your front L/R channels, I'd recommend the Classe CAM-400 mono-blocks with the 5-channel Classe amp to complete the system. Try listening to that first before mixing in things from other manufacturers.
I'd also suggest widening your search to include other manufacturers so you make an informed decision...again, all offered 'for what it is worth...'. Best of Luck!
Having owned an SSP600 and been VERY happy with it, I'd say you are on a great track with either an SSP600 or its successor the SSP800 and that you should listen to an all-Classe system with your B&W speakers. Specifically, if you want to have mono-blocks on your front L/R channels, I'd recommend the Classe CAM-400 mono-blocks with the 5-channel Classe amp to complete the system. Try listening to that first before mixing in things from other manufacturers.
I'd also suggest widening your search to include other manufacturers so you make an informed decision...again, all offered 'for what it is worth...'. Best of Luck!