For $1,000 & sealed sub(s), there's only 1 choice that makes sense IMO: the SVS SB-1000. It's a compact, powered, sealed 12" sub. I use one in my home office (where I have a relatively refined desktop audio system). It sounds very good and I only wish there was room for a second one.
With your speakers, you'd probably only want these dialed in at 50-60 Hz, tops. Because they're sealed, the bass doesn't go quite as deep as it would w/the ported version--but that's actually better, since the sealed design (in my experience) outputs more natural sounding bass.
With your speakers, you'd probably only want these dialed in at 50-60 Hz, tops. Because they're sealed, the bass doesn't go quite as deep as it would w/the ported version--but that's actually better, since the sealed design (in my experience) outputs more natural sounding bass.