DOnt know to much about the alpine type x except that it takes alot of power. I whould go with the JLW7 personally. I have 2 jl12w6v's sealed and im thinking about switching them in for 2 10W7's...what do you think. I will be using 2 jl 500/1's.
I'd prolly go with the JL's. Just be ready to pay more than twice the price though. For the cost I'd say Type X though. Even though the Type X takes more power, the W7 would probably out-do it.