Haha... Thanks much, Brent, for that thorough comparison. I swear though that you must be trying to sway me back over to the Onkyo 805.
What to do... What to do...
I don't think I'll want to bother w/ the 705 since the street price diff (maybe just ~$150) isn't that big between that and the 805 -- and I'd just be doing a trade-off, not something definitely better, for the higher street price of the 705 over the Yammy 663 (by maybe ~$120-150).
Maybe I need to figure out how likely I am to upgrade again in the forseeable future. If I'm not likely to upgrade again for a long time, then the Onkyo 805 probably makes the most sense for me -- and would also serve as a better backup in case my B&K 5-channel amp dies (just like you were thinking). If I'm likely to upgrade to a dedicated prepro in the next couple years, then the cheaper Yammy 663 would make sense. Things to consider...
Thanks again...
_Man_