Just this weekend I had the pleasure to ride in the new M5. UNREAL. I need to post the video I got of it.
If it weren't for the other cars on the highway, it'd be easy shatter the triple digit mark in the speed department without feeling like you're driving like a maniac.
I've driven an E39. That's ridiculously great as well.
All the Bimmers I've driven/ridden in have had the Passion Package. It's supposed to increase excitement by 60% or something, but I'll have to double-check the numbers on that.