Well Fi underrates their subs, they can take more power than what their site suggests which has been proven a lot, same with other companies. Yes the AQ does rated power, but just because an amp is rated at a certain amount, doesn't mean you have to make it produce that much power. With keeping your signal clean, and having a decent electrical behind the amp, I don't see you running into a problem.
But there are many amps out there that will do around that power you are looking for, there isn't really a "best" to use. I just use AQ because they have been very reliable for me, and don't break the bank.