New Speakers up to $15k - The more I read the less I know!

pilrem,

nonoise is correct. You really should go out and listen to various speakers in that price range. If you can get an in home demo, all the better. In regards to the speakers above, I have experience with all three. I owned a pair of B&W 802D's. Nice speaker but is a little mid bass heavy in smaller rooms. The diamond tweeter is very articulate and fast. 

I now have a pair of Vandersteen  Treo Ct's, with a Vandy 2Wq sub. This combo is excellent and has the classic neutral Vandersteen sound. I also listened to the Quattro Wood Ct. It is even better overall, but alas, I could not afford them at 14k. They would be a very good choice to put on your short list of choices.
Cheers,
Tim

Don't solicit opinions on "sound," just ask for recommendations based on your current gear and room size; then, listen for yourself. Also, don't get stuck on price ... you may find that you can get great speakers that will fit your needs and ears for far less than your maximum price point.

For that kind of money, you should expect an in-home audition. 

Previous comments reflect my take on this.
The best thing anyone considering buying speakers is to visit as many dealers as possible and audition as many speakers as possible.
Don't get caught up in the associated equipment. Just get you ears open.
I promise that you will find a speaker that speaks to you.

That being said, Vandersteen is probably one of the best choices out there. I, too, own the Treo's with the 2wq subs and am not in a hurry to change anything.
Other companies you may consider:
Magnepan- many Vandy lovers like them. I know I do.
Zu- I had a pair of Union that sounded very close to the 3a sigs, but something was missing...
I know that Zu and Tekton have trial periods, so you can listen to the speakers and only be out of shipping costs.

Agon member, Ctsooner will probably be chiming in soon, he has a pair of Quatro Wood CT's and knows about a lot of other speaker manufacturers. I bought his Treo's, so I would think the Quatro CT's would be a good move on your part. -In my opinion, B&W are nice speakers, but not as good as Vandy's-something about the time and phase alignment sets them apart. (And even though the Zu are full range driver/no crossover speakers, the Vandy's just seem to do thing better).
HTH
Bob