going ported will make it shake your car more...as for hurting your hearing....hearing is overrated anyways. if you want it to shake your car more but not sound as loud....wear some ear plugs. you cant really get serious into this hobby and have your main concern be if it is harming your hearing.
That's a good point, but I used to be the same way. After a while, you'll be fine with turning it up really loud every once in a while, I would guess.
I personally would tell you to go sealed, dude, because even sealed, that will have plenty of bass for daily driving. I had two 12" Type R's sealed and that was a shitload when the gains were up.