I just added an SVS PC-Ultra to my Aerius's and it makes a big difference in the sound of the speakers. There is more weight, obviously, but it also seems to make all the instruments sound more natural. The PC-Ultra is about the same price as the Velodyne you show, but I'll bet the SVS goes lower in frequency and I can verify that it works great for deep movie bass as well as music.
The SVS replaces a Mirage BP-150i. I thought the Mirage was well integrated with the Aerius's, but the SVS is much "tighter" and blends more seemlessly. The sound is very choherent with it.
As I look to upgrade the Aerius's the SVS Ultra is so good that I will probably go with the Vista's. Why spend the $$ on powered woofers in the Vantages, when they will be crossed over at 60 Hz anyway.
Chuck