Bloody hell; I've got admit, the restriction of current production vehicles somewhat dampens by enthusiasm as I cannot include many of absolute favourites as they are no longer in production (Lexus SC400, BMW Z8, Porsche 993, Honda NSX, Acura Legend). Thus means creating such a list is even harder as I cannot go back into the past.
The (somewhat) Practical Collection:
Mercedes-Benz CL63 AMG
Mercedes-Benz SLK55 AMG
Mercedes-Benz E63 AMG
Audi B7 RS4 Avant
Lexus LS460L
Lexus IS-F
Audi Q7 4.2
Infiniti FX45
Ford Focus ST
Sports Car Collection:
Pagani Zonda Roadster F
Spyker C8 Laviolette
Ascari KZ1
Bugatti Veyron 16.4
Bristol Fighter S
Marcos TSO GT2 Sports Package
Wiesmann MF4 GT (V10 version will replace this one once it's released)
Whilst I realize that is "just" 16, anymore means that I am choosing vehicles that I don't really want. Even then, 5 cars would be have been more than enough.
As for the lack of BMW's on my list, the upcoming X6 seems like a very interesting prospect, so there's a good chance that it'll be on my list once it's released.