Speakers for leading edge, transients, speed and big sound

+1 on Charney Audio Concerto with the AER BD-3 drivers. Super efficient and awesome sound. Get a nice flea watt Set and enjoy audio heaven. 

I have the Companions with the AER and a couple of SVS subs and could not be happier in my 24x32 ft with 14 ft ceilings. Gets plenty loud, even with my 1.5 watt 45 SET.

The Companions go down to 32 Hz. The Concerto goes all the way down to 20 Hz, so probably wouldn't need subwoofers

there's so many really great used speakers in that price range provided you have an additional budget to buy amps that compliment the speakers.

If the $20-30k is your entire budget it would help us to know what you're using for source and how your room sounds, bright, neutral or dull?  

You really shouldn't discount the Tektons. Definitely consider Encore or better yet, Ulfberht's perhaps with Be upgrades. I currently have Moab's with the Be HF drivers only. They are divine. I'm driving them with 60 Watts of Class A Tube power. They're absolutely wonderful. There's also the 1812 Model V12 at $14K.

+1 Volti Rival. What @Doyle3433 said.  It’s a magnificent speaker.  I’ve been running mine with QuickSilver MidMono’s (NOS EL34s) from the beginning. Just stunning!! 

I take delivery of a Tool Shed 300B amp today. I’ll be swapping in the WE tubes from CAD300SEI for a glorious listen session this evening. 

Active or passive ATC.

Dynamic and play loud.