What does one purchase after owning horns?

That's a really tough one as it's difficult to match the speed and dynamic prowess of horns. I struggled with it after having to go to a smaller listening space and knew I'd be limited to more traditional dynamic speakers because of the space limitation (you may not be faced with that). From one horn lovers perspective here are a few of my likes: Ultimately I was very happy with with Coincident speakers (I had SuperEclipse III's for a few years, but his current models are certainly worth hearing as well and have similar qualities). I'm now using AudioMachina and could not be happier, but they'd be beyond the budget you stated. I'd also second the AudioKinesis recommendation - his stuff is brilliant... definitely fast and dynamic, with seamless integration of the lows with his SWARM sub system. Of the planar stuff I've heard I've really liked Roger Sanders speakers on two different occasions hearing them. Daedalus speakers are also brilliant, especially the larger DA-RMa and Ulysses.

There is only one solution to your problem...Trios

Soundlab A1's and up can be quite dynamic with a little effort.

First and most important is they need lots and lots of good power to really come to life.I have 600 watts of SS power per side that delivers 2400 watts into 2 ohms.This alone has my M1's really singing.

Second is I modified the backplates with far better parts and bypassed the brillance control. Huge improvement in dynamics. These M1's now have it all .

Soundlab's don't seem to get much attention these days and I am not sure why. To my ears they play natural sounding music that is effortless and almost magical. They can play at concert level volumes and offer unrestrained bass down to 20 htz without a hint of coloration or overhang etc...At least in my room:-)

Top to bottom cohesiveness is stunning and makes for a wall of sound that is often breath-taking.

If at all interested I highly suggest an amp capable of putting out what I mentioned above.

I tried OTL amps on my M1's and while they worked and sounded quite nice, these speakers need gobs of power from an amp that can handle impedence swings from 2 to 40 ohms to sound dynamic and best.

Have fun on your search!

Try Eggelston Rosa. Great midrange detail and full range bass in a small package.

for a little something different, take a look at some speakers from Danley Sound Labs that are now being used in the home. Very efficient and dynamic as well.