The Hsu VTF-15H Mk2 is their top dog subwoofer and a very good value. The VTF-3 Mk5 has almost the same specs as the VTF-15, but will lose a couple dB output below 25 Hz to the VTF-15. Both of these subs are very solid values. The ULS-15 Mk2 is Hsu's updated version the the original ULS-15. This is a sealed design and is recommended for room volumes under 3,000 cu. ft., although would still be impressive even up to 4,000 cu. ft. For your room volume, I'd be looking at Hsu's top ported subs if you prefer to go with Hsu.
I would also look at the subs from other companies and compare size, weight, finishes, specifications, shipping charges and warranties, before making a final decision.
Music area: Magnepan 3.6, McIntosh MC2205 amp & C48 preamp, SVS SB13-Ultra, Oppo BDP 95, dbx 3BX, and assorted equipment.
Movie area: EMP Tek E5Bi (were rebadged to R5Bi), RBH/EMP Tek R55Ti, PSA S3000i, Denon X2000, Oppo BDP 83.