watts is the amount of power the sub can take before blowing
if you have a 200watt sub and a 500 watt amp you need to turn down the amp or you will blow your sub
the nicer the speaker usually the more "tight" sounding the bass is, less boomyness. if you want another JL id look into the W7 if you have a few extra bucks to spend. but youd also need a larger amp for it.
just go to a car toys and have one of the sales men show you all the subs they have and you can decide which you like best.
Alpine are a good brand for the money conservative
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