i cant say that i am fimiliar with that JBL sub, but if you are happy with it, thats all that matters. keep in mind, if money is a factor here, then go ahead and upgrade tha sub last.. get your fronts, center, and surround, then worry with the sub once you get everything else up and running.
and if you want to eventually run both subs, i dont see how or why that would be a big prob. as you mentioned, they probably wont be perfectly matched, but do we really ever reach perfection with anything??
good luck.
bigjohn
