A partial update. My son definitely likes the Hsu. (And to recap, we both thought the Polk we tried and returned last year did not produce decent sound.)
But my wife surprised me with a VP100 for Christmas. Definitely overkill for my 13x14 room I listen to music in. But that's okay, overkill is good! So I've been playing with that instead of doing the Hsu/Velodyne comparison. (And another aside, my wife, a non-techie, said she really liked dealing with Axiom; said they were extremely friendly and helpful.)
But I think I'm going to keep the Velodyne and use it in the dining room (we have a small 'executive' system to play music while we cook and dine; it has a sub connection, so what the heck); so at some point I will do the sub comparison.