Need Wireless Subwoofer Options

You can probably score a pair of Vandersteen 2w's for under $1K, but you do need crossovers. In my opinion, the best way to add subs to any system.
Also, HSU subs are a great value for the money, too.
The JL should probably be a good upgrade, but seeing you are using a Cambridge pre, I think the HSU may be a better match. Plus, you can get a pair within your budget.
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treebeard, I couldn't possibly change your perception. The affect an HT receivers room correction has or the affect built in room optimization has on a subwoofers performance is a substantial reality. 

The ability to mitigate system and room integration as well as to make personal taste decisions is all about the level of control one has with equalization. The low frequency in much of todays recordings can be all over the place. Polarity can change from track to track on a single album. The Wi-Q Velodyne I suggested allows you to make very usable EQ adjustments from the listening position. It's not their top shelf system but it seems to have the functions I use often with my pair of Digital Drive Plus. 

There are vinyl recordings were I mute the subs altogether. When I cue up Prince's "Musicality" it gets preset #3, bumpin'. 

I suggest reading any subwoofers setup procedures which will give you an idea of the products capability. Good luck with it.

@m-db Thanks, but for now I'm going to stick with what I have and use the wireless JLINK system.  If the spousal unit doesn't like the wireless locations of the sub then I'll look for something smaller that fits behind the couch.

@gdnrbob I'll look those up id it comes to that.

Thanks, though I still want to know how well wireless works with your system. I might consider it for my system, as well.
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The JLINKS system arrived yesterday and I hooked it up last night.  Very easy.  Listened last night and at high volume today.  So far, I'm loving it. Some oberservations:

• I now need to turn the sub up higher to get the same bass, but I think that's due to its new location.  Before it was in the corner of the room and now it's next to the couch with more space around the sub.
  
• It's no longer boomy!  I'm hearing more texture in the bass and feeling more reverberation in my gut.  Probably due to the new location.  I love my sub again.  @m-db  I'm back on the Velodyne bandwagon!
• No dropouts that I can tell.  

Really, the advantages above are not due to the wireless system but the flexibility it gave me.  And the spousal unit likes the new location.  The corner of the living room now looks empty but that's my wife's problem now :)