Thanks, Bridgman. I still have to decide whether I want to go with separate amplification or not. That integrated DSP/amp with selector sounds just like what I need!

Regarding signal conversion, I wonder how detrimental each pass could be. Let's say I'm feeding the DSP a high quality signal obtained from a 24/192 source by a high-end DAC... would it degrade in the DSP unit? I've read that frequency is less important that bit depth so maybe the potential loss is inaudible.