For high $$$ look at JL Audio F-112 and F-113. Did you look at the HSU site? For cost vs. performance I don't see you beating the Outlaw and Aperion stuff. If you already have an LFM, why not get another? The box size is reasonable and the LFE will be awesome. Most of us never challenge these components to their design levels anyway. And if you do, the warranty is always there as a backstop.
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Music system
Model 990/7500/Magnepan 1.6 QRs/Technics SL1200 MK2/Aperion S-12 Subwoofer/OWA3/Sony NS75H DVD
APC H15 Power Conditioner

TV System
Large Advent Loudspeakers/ Polk center/Monoprice surrounds/Panasonic Viera 42 inch/Onkyo HT-RC260/Sony BDP S590/Directv


Home Theater System
Onkyo PR-SC886/Outlaw 7125 Klipsch RF-82 L/R,RC-62 center, RB-35 SR/SL, BENQ HT1075, Outlaw LFM1-EX/OPPO BDP-83/Directv
Harmony ONE
Blue Jeans and Monoprice interconnects
APC H15 Power Conditioner