Wow, not even going to really try with this group, you've all obviously driven one (more then just around the corner) and know exactly what your talking about, good stuff! (If your sarcasm meter is going crazy then its working.)
Anyway, what I can tell you about it which is interesting is the types of people I see driving at the local track. About half the owners of 1M's in our city track it, at a normal track day event I might see one M3 (E9x) and I'm sure there are hundreds of M3's in our city.
If you want a GT car go for the M3, I wanted a track car so I was looking at the Cayman S or 1M.