High value, giant killer speakers?

At what starting point does a loudspeaker have to be to be a 'giant' killer? Obviously the LRS is, but can a speaker that costs $9000 be deemed as such? The new Elac bookshelf loudspeakers as heard at the RMAF this year certainly are slayers to my ears.

So subjective. 

Seas A26 kit

they replaced my Harbs shl5plus and im just as happy.

Audiokinesis (Duke) has made giant killers for a long time.
His Dreammakers are better than many speakers that cost 3 times more. They are also easy to drive which always helps keep amplifier distortion down. Very neutral, nice extension, excellent soundstage- hard to fault.

@helomech How do you like bigger Mags? 3.7i or 20.7 ?

The 3.7is are too bright for my taste and lack coherence compared to the .7s. I haven't heard the 20.7s, but of the more affordable Maggies, the .7s are the best to my ears; they're actually capable of bass "slam" unlike the others I've heard. One would assume the 1.7s are even more capable in that regard but curiously, it's the opposite. I can only surmise the crossovers of 3-way Maggies cause significant dips at some bass freqs.  In all fairness, I find that 3-way speakers from many brands suffer glaring weaknesses.