All I can say is god bless Amurricaa - most teens here in the UK would bankrupt themselves and their parents for an old Peugeot 107 or shitty old Nissan Micra!
If you have the cash, bloody go for it!!
Insurance quote for a 435i must be around £30,000-£40,000 here for 17/18/19 year olds, if you get a quote at all!