if you take it fairly easy, and don't charge all the time, then the 120's should be fine. you're probably not gonna have your din set any higher than 10 anyway.
^ I agree. I have been rocking 12 dins for years. I am 6'3 and like 180ish. I doubt you'll need more than 10. If you plan on charging some crazy shit... then crank them up for that day. Just don't leave them at like 11-12.
the axel 12's will do you just fine, i have look px12's my dynastars and there really solid and i have never pre-realesed. if you decide to go a little crazyer for the day just crank them up to 11-12, but for you id say 9-10 would be perfect