Hi Z Legend, i hope you don't mind me jumping in here.
You may have already spoken about this, but have you looked at the G37 (now Q60)? It's got a very similar engine to the 370. Admittedly they haven't held their value as much as we would have liked so you can pick up one now for a bit of bargain!
I also feel compelled to say the Steer-by-wire system does have a mechanical back up if all else fails
Cheers