just go to another bmw forum and find out whats the biggest wheel size you can go without having to roll-pull fenders and strech tires.
what i mean by that is fine the best offset you can do, so it will be flush with the fender. don't get some gay cookie cutter wheel thats like 17x7 +45
it totatlly depends on the design. those pics I just posted are about as euro as you can get! the site is a .de, wich is a german site. wheels that stick out, with streched tires and huge lips like that is the "EURO" style.