This sub has more quality then any JL sub. It also is more musical and warm.

Yes you will need an amp for the sub. It would take 200w like its nothing (150 is rated RMS). The sub itself cost around $100.

One of the best amps for that sub would be the, Zapco, ARC Audio or Directed DEI amps. Ive been extrimely satisfied with them from my previous expirence.
I am not sure whether you want to run your front speakers and the sub off the same amp or you going to use a separate amp for a subwoofer?

Thanks retrodrive! Now my questions are:

(1) there are two models of 10 inch subs of IDQ by Image Dynamics which one is it? Also, what's the cheapest place to get it?

(2) Do you think i should go with an amp to amplify my woofer or woofer and speakers? Cause i just wanna do a step at a time but if it saves money a bigger amp might just have to be done.

Thanks so much.