I have Velodyne CHT 12 and CHT 8. I auditioned everything that was locally available and Velodyne beat them easily in terms of price to performance. This includes, Klipsch, Polk Audio, Infinity, Sony, JBL. KLH. Yamaha and several other brands I can't remember. I remain extremely pleased with both of them. I can't comment on the other brands you mention in your post because I haven't heard them. At this point, my general take on Velodyne subs is that other companies like Hsu and SVS (and maybe others that aren't available to you) are probably providing a better product at the low end of the price range but a Velodyne sub is still a high quality sub from a company that essentially specializes in subwoofers so you can't really go wrong with it.
