The Rogue Pharaoh has the features I'm looking for. However, I had a negative experience (shared by others, apparently) with the Sphinx, so I'm leery to take another (expensive) chance.
It sounds like Ayre is the leader right now, judging by the responses and the reviews I've seen. My listening room is about 15x13ft., so I'm sure that it would be enough power.
Another option that I just came across is the Red Wine Audio Signature 16. My power is terrible, so a battery powered amp (with a tube stage) sounds like a great idea. It's only 32wpc into 4 ohms, but I'm intrigued.
As an experiment, I hooked up my old NAD 316BEE to my system last night (40WPC), and it's much more dynamic and has better bass control that my Hegel does, although it lets through much more digital grit (that damn a/c current again). I wasn't expecting that at all, so I'm reconsidering the power needs anyway.
Thanks again for your thoughts, and feel free to keep 'em coming!
Scott