Sub woofer

I agree with akg_ca. I have the Vandersteen 2w's (not q's) as well as Hsu subs (VTF?), and can attest that the vandy system is truly outstanding.
The HSU is no slouch, but the vandersteen crossover really does work wonders.
As bob_reynolds pointed out, HSU subs should do the job for you and save you some money that could be put to other upgrades.
Bob

JLAudio you cannot go wrong. Especially if you want it for movies

NormL

If you want a great reasonably priced sub why are you not considering a Revel B110? Typical overbuilt Revel.