Crunchy means a game focusing more heavily on mechanics than on Rule of Cool, which is the cinematic. If you're restricting players to a caster class, that's crunchy - but if you're giving them a whole bunch of other things to play around with, that's cinematic. Here you have to decide which is more important to you in the long run: the basal restriction of your players, or the variety of options you're giving them to make up for it.
I can't advise on the system to run however. Personally I'd just stick with D&D or M&M. I'm sure plenty of munchkins would point out that neither is especially balanced on the crunchy mechanical front - and only a small fraction of them would ever be seriously listened to as regards cinematic approaches - but it's all about the sort of game you like to play and are hoping to provide for your players here. When you can specify what that is, then a system can be offered up.