You will most likely be duty free if you go SVS, that's true.
I don't care what anyone says, if a sub can hit 20hz with authority, and all you've listed can, then they should be amazing for home theatre. That isn't always true when it comes to music. There are others that can explain it betterthan this but: some subs are just plain better when it comes time to reproduce music. The fact that the axiom can hit 15 hz (albeit down 9 db) means that there is virtually nothing that this sub can not create in terms of low. The fact that it is accurate with music is a bonus IMO, and does not take away from its home theatre performance. When people are saying that the Axiom is a Music first sub what do they mean? That it is faster, tighter, and more accurate than the competition? Not a bad thing in my opinion, and my usage for my HT gear is about the same as yours, 80% Movies/20% music.
If I were you, and had a $1000-$1400 budget (I wish), I'd stretch it so that at least you can give that sub the try. Between the Axiom and the SVS the Axiom is the one that will only cost you beetween $30 and $70 to audition. That SVS would cost you at least $150 when you factor in shipping both ways. Plus the non-refundable brokerage fee. So you're looking at a minimum of $200 just to try the SVS. I'm not pimping Axiom here. If I were picking from the list you mentioned I'd have to give the Axiom a try. While it's at your house you can take it to a Paradigm and an HSU dealer if they are receptive to allowing you to A/B the products. Believe me, most shops are willing to allow you a breief test if it gives the salesman a chance at closing a deal on a $1000 sub. If you hate all 3 subs or just think you can do better give the SVS a try. That's how I'd do it anyway.
If you told me that right now I could have one of those subs free I'd take the HSU. I know what it can do and it is at a minimum as good as the Paradigm.