Best Kept Speaker Secret?


OK all you speaker experts out there here goes. There are always "sleepers" or "exceptions to every rule or cost" in high end audio equipment. In your opinion what is the best kept secret or exception to the cost for the very best speaker you can buy for $4000 or less (Used). Your feedback will be greatly appreciated toward building my short list. Thank you.
golfnut
Ok, I'll bite on this one:

$4000 +/- 10%

Best deal: Infinity IRS Beta, although $4000 is low, but doable depending on seller's desire to move 'em. Problem:
Need serious biamping and frontend to sound their best.

Aerial 10t. Doable at $4000. A speaker most folks think as part of an HT setup. How wrong they are. Michael Kelly has built what IMHO, beats many designs up to $20K.

Maggie 3.5r/3.6r and a sub! Doable at $4K. Planars!!!
A no brainer here.

My opinion, your's may vary.

Paul
VMPS
Check out the newest RM-2 or the RM-40. The RM-40 won Best at CEC show. I haven't heard these but being an owner of older VMPS I would highly recomend. I don't think you could go wrong with either.
Von Schweikert 4.5 -- you've got to hear 'em to believe 'em.
I just picked up a pair of Thiel 3.6's and am conflicted since I then heard the Von Schweikert's -- unbelievable!
http://www.vonschweikert.com/vrline/VR-45M.HTM
Although the above choices are wonderful, my personal favorite, and the pair I own, are the Vandersteen 3A Signatures.
ditto on the bigger Magnapans.. I've heard these demo'd. a few years ago and they are great.