First things first, you gotta check the amount of space you have to work with bro. Might want to bring your ride to a good installer and let him check it out so he can discuss the options with you.

There are a ton of good 10" subs but if space is really too tight, you also have a few good 8" sub options now as well.

(as for the type of box - sealed boxes are quite a bit smaller than ported boxes so when space is a major issue, that might really be your only option. Only way to know for sure is to discuss with your installer after he checks out your ride )