Best musical sub under $1k?


I’m looking at subs under $1k. My mains are KEF LS50 Wireless. The room is about 12’x15’ and the KEFs are on a desk. The sub would go under the desk which is fairly open underneath. I’ve been looking at the SVS SB2000, even the SB12 NSD which is available well under $1k at $400, the REL T/7i and the ML Dynamo 700w sub. I don’t want anything physically large so the HSUs are out.

Thanks for any input.
asahitoro
Hi   asahitoro,

   Recently I was displaying at a show that SVS happened to be at.  I went by their booth and to my surprise,  the US Marketing director was there and happened to be an old friend.... The SB12NSD is a product that we intended for Black Friday,  it is a blend of the 1000 & 2000.  Not sure how much better you'll get @ $1000, but for Under $600ish,  it seems to me to be a steal.  I'm under the impression that this model will eventually sell out and when they're gone they're gone,  You might call SVS to confirm. 
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Thanks for the replies,

Yes, the SB12 NSD does seem like a steal at $399 shipped. I think the SB2000 might be too much for my needs and I can get the SB12 for less than a SB1000. I just want something that can help the KEFs a bit when needed and again, only for music.