Speakers for leading edge, transients, speed and big sound

@ghdprentice Magico A5 would for sure work.
At 180 pounds per speaker better have eaten your Wheaties. 

I do think you sound like you want some horns.  Maybe Klipsch or Altec remakes.

Get 2 pairs of speakers for different flavors,  not get bored with the same speaker and to accommodate a wider variety of.musical genres. Your room seems big enough to fit 2 pairs & the following should fit in your budget..

Speaker#1 JBL K2 S9900

Speaker#2 Tekton Moab

Tektons with the mid array have a very unique sound...its own separate category of speaker.

I am looking to spend about 20-30k on used speakers ( guessing they would have been -40K new a few years back). Any suggestions welcome. I have a 14*20 room and I am looking for dynamics, potentially a great sounding horn or equivalent. Excited by Tektons but since I have the budget wondering if there’s anything better. I did have the JBL M2s that I really enjoyed and Revel Salon 2s that I didn’t so much

Avantgarde, perhaps.

I heard, and liked the Moab.  It is a well balanced system with decent dynamics at modest listening levels (the real test of dynamic capability is how lively the speaker sounds at low levels0.  The JBL K2 is very dynamic sounding and is very good, although not as full and rich sounding as I personally like.  Klipsch speakers are decent, but, modern horn compression drivers and modern horns are not as good as the very best vintage ones, with the exception of some ultra expensive drivers from companies like G.I.P. and Goto (single drivers can blow this budget).  Avantgarde Uno or Duo are quite dynamic, but the bass is not that well integrated with the rest of the sound; still it is a good candidate for a used system.