Okay, so what is it you want to know about DC subs then? As I said a level 2 could most likely get louder than the Kicker, level 3 and up most definitely. They do cost more, you get what you pay for.
That said, shop around. You have time to do some research, and I don't think fixating on one specific brand is a good idea.
EDIT: Also call them up. This is their business, they will not mind answering questions for you.