High value, giant killer speakers?

In general dipoles play nicer with your room than box speakers, hence Maggies, and my current home built Fostex 103/Eminence Alpha 15s.

Quad ESL 57.  For me the 63s and their derivatives throw too much treble and midrange energy into all but the largest rooms.

Vandersteens - all of them.  I honestly prefer the 2s to the 3s, even though the 3s are more accurate, and the 2s with a pair of the subs over the 5s, for the same reason.

Siegfried Linkwitz was a giant; it would take the price of a new car to best his Orion speaker system. Behold the dominating sound stage, my audio brothers!

I have auditioned many speakers over the years from $3k-$300k and IMHO I was blown away when I heard a little known speaker in the USA that was reasonably priced retail $6k that crushes many speakers more than 5x,10x their price. The speaker is made by Amphion in Finland. The price performance is oof the charts. I spent approximately two years auditioning speakers and amps before investing. When allocating a significant  amount of money for a high end system, after all that testing, I bought the Amphion Argon 7L on the spot. They are quite efficient at 91db. When paired with a good amp you will be delighted. I actively continue to audition speakers and amps and thus far have not found a speaker that outperforms at this price range. Worth a listen if you can find a dealer. 

Vandy 1ci

What most forget about and hardly ever take into consideration is the room you are listening in.

I have heard very expensive gear sound only so so..kind of bland and I have heard moderately priced gear set up correctly in a great sounding room sound fantastic.