Image/soundstage and punch/bass

I agree with johnto...Consider 2 subs.

Then obsess and make it a science project.
https://forum.audiogon.com/discussions/best-way-to-integrate-subwoofers

Seriously, place a couple of subs behind the maggie's and "have it all" as mentioned. 

Or, get lost in audio nervosa  and follow a thread like the one linked.

Eminent Technology LFT-8b. Magnetic-planar drivers (similar to those in the smaller Magnepans, but push-pull rather than single-ended, and in a metal frame rather than glued to MDF) from 180Hz up, a sealed enclosure 8" woofer for 180Hz down. They play louder than the smaller Maggies, and extend lower in frequency. $2499/pr, home audition available for those without a dealer within 150 miles of home.

IMO you're asking for a lot at $2500.  Subs are the obvious choice, but if that's not your bag these Nola Vipers might be a good choice.  Bass down to 28 Hz and mids and tweets are dipoles like the Maggies that may appeal to you from an imaging perspective.  At $3500 they're a bit over your price, but as I said you're asking for a lot, and these were originally $8000. 

https://www.usaudiomart.com/details/649497865-nola-viper-ii-plus/

Add two good musical subs like the Rythmik 12” or 15” sealed. That will fall within your price range and should integrate well with your Maggie’s keeping the “air” and delivering the punch!

I paired two of the Rythmik F18’s in a rather large room with BG Radia FS-420i planar ribbon speakers and the difference was startling.

www.rythmikaudio.com  

I have a pair is Magnepan 1.7i and run occasionally an older Paradigm or Snell subwoofer with them. That is about as good as you are going to do for $2200 for the Maggie’s and the rest on a subwoofer. As for the Dynaudio’s: I had been a big Dynaudio fan. That ended when I heard these Magnepans. They replaced my Dynaudio Contour 20s. I’ve heard the Special 40s. But I am sorry. They are not going to cut it against the Maggie’s. I have to say that at $2200 the Maggie’s are the biggest bargain in speakers today. I am waiting for my Mye Stands to come and the Bass should tighten up further.