Welcome the Sub club. I am in th same dilemma only my current sub SUCKS!. I can't decide what to buy, I know Mojo and I are looking into the Paradigm DSP subs and hopefully we might find someone here willing to uncrate one for us to hear and their prices are around the EP350 v3.
Having heard the Hsu STF3 I know you Hsu has more than enough rumble but you may be looking for something with a little more tightness for music? The EP400 does this very well and could be turned up for HT to try to equal the ouput from the Hsu to help spread out the LFE. Just one more option.
