Sub for Paradigm Studio 40 v4

I want something to just hit the bottom notes. 100% music, no h/t whatsoever. I had an SVS PB 12 NSD, but it was just physically too big for my listening area which is in a loft, so I have a lot of volume, but not a lot of floor space. I Have a budget of $700.00 (I know...laughable to most). I have looked hard at the SVS SB12NSD but I found a Paradigm Ultracube 12 that was a demo for a bit less. Any advice is appreciated...Thanks!
I had the SVS SB-1000 and it was real nice! It has a smaller footprint than the 12NSD and you can't beat the price! It is great for music only systems,real tight bass no boom!
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Thanks Bob.... I have seen many of your posts and value your opinion. I believe the SVS has that capability .... not so sure about the paradigm . I'll check into it.
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Thanks again Bob. I thnk I will go with the SVS, but I'm contemplating 2 of the sb1000 instead of 1 sb12 nsd... Decisions decisions. My music is mostly all kinds of rock and alternative with a little acoustical thrown. Nothing that really hits super low anyway.