Honestly know absolutely nothing about Sphinx and Couger examples given here. I assume it will be hard to find a place to try these out but I'll keep them in mind.
If I was going to track down one of these good older-model S&W's, I'd probably just dedicate the time to finding a German made Sig P226. It is strange to me that it seems like S&W never retires revolver models but seem to constantly change semi-auto models.
I know a lot of people are being particular about size but again, I've carried a Glock 17 without any real issue, so duty/full size is not something I have any particular need to avoid.
At this point I'm definitely leaning towards the HK P2000 and Walther P99 as my focus, though i still really want to get my hands on a CZ75. I somewhat favor the P2000 at this point because I like the external hammer and release, though the P99's AS trigger does seem quite fascinating after watching a youtube video about its behavior.