I should add that the choice of actual subwoofer is IMHO less critical. The least expensive downward firing SVS cylinder is (or was, on closeout) IIRC about $500 to $600, and I'd wager that it's a good performer - all of their products test amazingly well for their price tags. I'm sure that there are other good choices in this price range as well. At a total cost of app. $1250 - $1350 this combo (SVS/NHT X-2/Velodyne SMS), I suspect that this combo will meet your needs and then some.
Marty
Marty