Oh man, dealers. The Alpina logo is a "special badge of honor"? Wow, gotta love the reasoning. Well, what's the situation then? Would you be trading in the 911 or the Range Rover, or would this be the 4th vehicle in your stable?
If it's a matter of necessity, I think you're already set with the M5 to be honest. However, if you need something more mature, which I personally don't think this car is (...in comparison to the M5 that is...what with the huge spoiler and whatnot), then I guess it would make sense as an extra car to have.
$116,000 could buy you a bunch of different cars. Have you thought of other options, like an M6 cab or a V8 Vantage? Just thoughts...oh...Audi R8 maybe?
E92 335i: Space Grey|Coral Red|Aluminum Trim
Hold out for the BRZ STI or... Rocket Bunny FRS. Update: Scratch that. I've got a 2015 5.0/6MT with my name on it.