"Scary fast isn't my thing, but I don't mind it either. I feel that my F6B is more fast enough for me, especially after riding H-D's for 20yrs. If I'm cruising on the highway in the right lane and a car is coming from the on ramp and we're neck in neck , I simply twist the throttle slightly and before I know it, that car is 100yds behind me. I had also seen a video of a rider on the 1600B pick the front of the bike up in 3rd gear with ease, so I'm sure it's scary fast! I would consider this a pro, though, not a con. I'd have to agree with your statement "which ever one you choose I see no reason not to be satisfied!!!"
As far as aesthetics, I think both bikes look great, but I prefer the front of the Honda over the BMW, and the rear of the BMW over the Honda.
I can only speak for the flat six being I haven't rode the 1600B...and I'm speechless when it comes to how smooth it is, and I'd bet the 1600B is just as smooth. As far as the stereo is concerned, I turned mine on once in my driveway just to hear it work, and I never turned it on again. A stereo on a motorcycle just isn't for me, but I know a lot of people enjoy listening to music while riding. HiFi Audio is my other hobby, which I save for when I get home.
It'll be a along 4 month wait before I'm able to find out which I prefer...this is also includes my F6B, which I might just find suits me best.