Alpine gives you very "clear" sound
JL/audobahn would probably be the loudest subs you can get. I personally have a JL amp and even though it's pretty expensive I don't regret having purchased it.
2 * JL w7's??? Are you joking? One of those subs is more than enougth, with two am pretty sure you would blow your back window.....
And the amp to go with would and should be a JL 1000/1