Any monitors clearly better than Pulsars?

After some recent amp and preamp upgrades, I'm wondering if it's possible to push further on my speakers.

Right now, I'm running Joseph Audio Pulsars, which I enjoy thoroughly. Because I live in an apartment, floorstanders are out of the question, and I know the Pulsars are some of the best monitors around.

My question is: are there any monitors that are clearly head and shoulders above the Pulsars, which might be worth a listen? Budget-wise, I could probably go up to $12k used.

In terms of what I'm looking there, really there is nothing specific. I'd say the same about upgrading from the LS26 to the REF 5SE; I wasn't looking for anything specific there, but the 5SE is clearly better :)

That said, I'd be hoping to find a speaker that is clearly an upgrade. If any other monitor would be a minor step up, or more of a lateral move, then I'm happy standing pat with the Pulsars.
I've heard the Raidho D1 with Luxman tubes and I've never heard anything so beautiful in my life. My close friend owns a shop and of everything he could pair with the Raidho, this Luxman amp provided the sweetest sound. For my personal taste, there's no speaker to date that can compare to the Raidho D1.
I have the Raidho C1.1 speakers paired with an Atma-Sphere S-30 tube amp. Beautiful sound.
Thank you Donjr and Sabai....just shows that Raidho should be partnered with tubes way more often than it is. Hope to hear it one day in tube set up.
Like mentioned above, try and see if you can take a listen to the Alta Celesta/FRM-2's. They are simply fantastic with amazing bass response for a "bookshelf".

There are several VERY positive reviews on these out there (ToneAudio mentioned in their recent review that they are at the head of the class in the sub $20k speaker market at this time)

**** Alta Audio dealer disclaimer *****