A_train:
I'm in your shoes. The ONLY reason i have 4 doors is because I couldn't get a Maserati 3200GT at the time I got the M5, and nothing compared for awesome power. I *LOVE* the M5 engine.
I have absolutely NO needs to carry more than one person, and if I do, that's what my dad's cars are for

Personally, I've never been a Sedan-fan, but at the same time, i love how understated a debadged M5 is. A debadged z8 is just stupid
As far as parking it goes, I only park in 3 places really: home, work, and occasionally school. If I do park @ school, I have my own spots and my buddies are very careful and watchful of my car. No problems there. Almost 75% of my driving is on the freeway, which is why I need the torque
As for windnoise - i drive with the windows down and the sunroof open all the time ANYWAYS, so to have the full on experience would be nice. THe question is, is this a car you can do 120mph everyday and get away with it (no one noticed a black bmw 5 series after it passes them, they'll remember a z8, right?).
also, attention, nope, don't want it. I mean, i can deal with people @ the gas station, but i don't want to have to deal with people rolling down their windows and saying "woah, yeah, way to go" or high-beaming me or the thumbs up (i generally do that to other people tho

so im a bit hypocritical.)
In the end, my "needs" are simple: a fast functional car that I can drive everyday. i dont care about the handsfree phone because I use my own cell. I dont care about the dials in the middle, as i'm sure i'd get used to it. A BMW is a DD car, IMHO.
So, does the feel of driving the car outweigh the need to park slightly further away (who cares?), deal with wind noise (who cares?), and learn how to read dials in the middle(who cares)? OH, and all the attention....
Then again, Z8's aren't too uncommon around here. I've seen about a half-dozen myself.
--Dan
PS: I'm not ditching the Spyder for this thing. Spyder is pure fun.