I fell a bit behind following this thread, so I didn't get to chime in on all of the BMW M5 bashing last weekend. LOL
I drove an M5CS with the wife at the BMW Performance Center in SC. She said, "you should buy this" to which I replied, "it's $135K and no". I found the ride (as in most BMW M cars) too stiff and it's too much money. That said, it is a phenomenal car, absolutely mind-boggling performance.
I've had 3 (yes, three) E39 M5s, the best car that BMW ever made. Even so, I always thought that the suspension was unnecessarily firm. It wasn't harsh like so many M3s are, but still a bit much. We won't discuss the constant, never-ending, frequent and continuous issues that seem to come up with those things.
So... in the "other things to consider" point that this thread started with, I decided that my BW is just too fast, too powerful and too expensive for me to take to the track. I am, or have become, a big ole' pussy, and I just don't want to go that fast. It's more fun to drive a slow car fast, than a fast car slow. In the middle of that spectrum, I bought a C6 Corvette. A base car, not the Z06, not a Z51, just a plain-old basic car. I'll slap some decent brake pads on it and go have some (slow) fun at the track. I just got it yesterday. Compared to the BW, it's just hilarious, super light clutch pedal, nowhere near the torque, although the ride is surprisingly good (I had one of these before, 12 years ago, but forgot most of it) and it's more "sporty" there's no question that I prefer the BW.