Fredrik, Welcome to the jungle! I love Zildjian, and think you should consider a 18 or 20' crash/ride or 18' medium crash. I consider myself kind of a minimalist with cymbals; my set-up (before the change) was 12' splash, 16' medium thin crash, 18' crash/ride, and an 18' high china boy. You can make about a million sounds with that set. Sabian has cymbals I'd look at, and other companies offer other choices.
Vince
http://www.vindrums.com