i have a vmps large, my best friend has a svs 16-46,and a guy he works with has a hsu-3.
we had a little thing a while back with all the subs .
over the course of the night everyone thought the vmps was the best sounding for music @ht( nothing negative about the others- they sounded very good also)
the finish on the hsu looks different in person than from the pics- still nice.
waf-vmps( none of the girls liked the svs)
the vmps has 2 speakers not one like the others(stereo)
all cost about the same( my sub was a kit with cabinet-1 hour to assemble- easy)
also the vmps doesnt come with a amp- you supply, a 100 watt per channel amp will rock your house.

i use mine with a pair of michaura m55s(almost a clone of the m22 axiom)it works seemless.
basicly you cant go wrong with any one of the above, but if you dont ever want to upgrade again-vmps large.

download the boston audio woofer cooker from winmx- 4 minutes of hell on your sub, its awsome.