Bentley Speed 8, awesome car!!
It's dirt cheap, but get the Isuzu 4200R Concept, and equip it with all the handling parts, and soft racing tyres.
It's amazing.
Buy anything you want
In the end, it's up to you to spend the money on what you want...
On my iPhone right now so I didn't check your garage, but if you don't have the Amuse S2000 GT1 Turbo I would recommend that. Leave everything stock with sports softs and it is a blast to drive.
1000 x any car worth $16,900. Then you'll be broke but with 1000 more cars.
KoiosI have a novel idea, buy what you like! Be that shiny new (insert car model here), or that lovely (insert car model here).
$16,900,000 in the bank. (insert anything) ( anywhere) he likes!