Just thought I'd post that I decided the McIntosh MC402 is what I'll be getting... I heard the MC501's at a recent comparison at my house, along with the CIA D200's and my current Butler... (BTW, The Butler surprised me a little at how good it really is compared to the others.)
I was thinking the McIntosh MC252 might fit the bill but I think I need more power to get the impact and control I liked about the 501's. I can't really afford the 501's so the 402 is going to have to 'do'...

Even though I haven't actually heard the 402, I feel pretty good that it'll work for me. Plus, I like having just 1 amp instead of 2... not a big deal, though. Another couple of good points about more power... they will work in a larger room if I move... and in my experience, more power equates to better sound at low volume.
The Mc's are notoriously quiet but they also deliver the goods when it comes to bass, detail, and resolution. They do have a 'richness' to them so they aren't completely without color but I like what I hear.
Thanks for all the recommendations... I'm happy to be in the 'home stretch' with my system. I think I've done as good as I can on this multi-year odyssey to sonic nirvana. I'm there and I'm very happy about it.

-C