At homecast.net a vendor called ~jhidley is selling Xd satellites with stands at app. $300/pair and woofers at $300 apiece. Now, while these include internal amplification, you must add your own x-over. Aside from the pricing, this may be appealling on 2 levels:
1) The original NHT x-over was a "watered down" unit (from, I believe DEQX) that didn't offer room correction. If you're okay in the price range, you can buy a full blown DEQX unit (new or used) and pick up rc at a relative bargain. By comparison, the full system being offered on clearance by Listen Up is priced higher than the above with a used DEQX, but a bit lower than a system with a new DEQX.
2) The x-over is the most complex piece in the x-d system. Buying this piece from a vendor that is still a going concern may be a good thing.
Good Luck,
Marty