I can relate to what Jack is writing about. He's looking for the best sound among a preamp-amp combo. For me, and perhaps for Jack, the HDMI switching may or may not be an issue. WIth a good HDMI switcher and dual HDMI outputs on the Oppo Bluray player for one, you can go to your pre-pro for audio and your display directly for video. If you need a switcher for more inputs, so be it. Yes, it adds some complexity, but it works and can work very well.
I haven't listened to either the Carey or the Marantz. I had read Michael Fremmer's review and it was very flattering. But there's a difference beyond inputs and HDMI versions when it comes to audio. When I play my analog out for a CD and then let my Anthem pre-pro decode, there's a definitive difference in the presentation of the piece. One is a more "intimate" approach and the other puts the staging further back--the 10-20th row approach. It's crazy how different it is... but it's different. Those nuances, soundstage, and overall balance among others are as important as the video experience. My hunch, and maybe I'm wrong, is that Jack might also listen to two-channel and thus, the better "sounding" pre-pro is important from that perspective.
Regardless, my point is that there is always a way around the perceived video limitations. When it comes to the audio, I think that the pre-pro and amp combo is still king.