I would by myself a fleet of old taxi's and police cars from the US to use as movie props, as well as a few extras for daily drivers.
Stuff like old Caprices, Impala's, Belvedere's, LTD's, Coronet's, Fury's, Monaco's, and those old 1968-74 Ford Fullsize models.
For my #1 car, I would buy a 1986 Nissan F31 Leopard. Those things are too cool!