Thinking of upgrading speakers, any suggestions?

Here is more info and comments on suggestions I am grateful for.
Room is approximately 19X19 ft, with a single corner, think of a fat raindrop shape, that is how my room looks like.
Room measurement with Tact showed pretty much flat curve from 150Hz and up, with no terrible nastiness below 150Hz, to the point where I see very little benefit from either tube traps or Tact.
The rest of system: Bryston 7B SST amps, BP26 pre-amp, Wadia 581i SE player, all interconnects balanced (VDH), speaker cables AZ Satori, IB2s sit on 20” SoundAnchor stands (including spikes).
I have heard MBL on several occasions, did not move me.
Heard only lower models from Von Schweikert, not impressed, will try to audition bigger ones.
Focal JM is also on auditioning list, as well as Wilson Audio (Sophia is in price range).
In regard to EB1, I do not see these as an improvement, in fact I think it would be a step back, as I prefer by a large margin IB2 with PMC’s dome midrange over IB1 (EB1 is kind of IB1 on steroids, more bass what is not what I am after, I have plenty of LF).
In regard to ISIS, yes, I know, hard to believe, but I should mention they were driven by some large VTL monoblocks and I must say that I was never a big fan of VTL, so take it with reservation. I actually heard my speakers with VTL and did not like it.
As mentioned, my comments are based on limited experience.
With present system I do get occasionally that eerie feeling of liveliness, even with less than stellar recordings as well as signal from cable TV when sometimes I am not sure where/who the voice comes from, as if someone in room is talking.
But I do not get fooled all the time. Am I asking too much?

What I look for is tonal accuracy, open and clear midrange and dynamics, as I feel these are the most important parameters that can give you impression of live sound, in other words a reproduced sound of live unamplified instrument is as real as possible, in all harmonic richness.

Given your described tastes, I can only suggest a bigger PMC or ATC - the midrange on the ATC 100's uses ATC's much bigger dome midrange drive motor (PMC mid dome is similar to the smaller ATC 50 in drive motor size, PMC like Proac used ATC drivers in the past).

The ATC 100's might be too forward for your taste and the bass might be too lean and punchy compared to the PMC TL design but you should at least audition them. ATC's also run class A to 2/3 power with three separate amplifiers (one for each driver - true active speakers) unlike the PMC IB2 Active which has a modified 4B-ST single channel amp on each speaker (great amp though - I also own one of these). Anyway the ATC may give you the extra edge you are looking for....however, quite frankly why bother - the current speaker you have is already EXCELLENT! (If you go ATC then definitely go active. With PMC it is not as important)

Oh one thing - if you want that "live factor" then you can pretty much forget everything in dynamic speakers except ATC, PMC and Genelecs. Forget about panels too.

One good option which also might work for you would be large horns - Meyers, Westlakes, Tannoys, Klipsch....etc.

Basically ATC, Quested (uses ATC's midrange) and Genelecs have been replacing studio main monitors since the late 70's. Previously all studio main monitors were horns, as nothing else could emulate live music at realistic levels/dynamics. Most studios still use horns for mains.

Here is a link to an interview with Roger Quested

Sting is a customer of Roger's and so are several other famous musicians and studios. If you read the article you get the impression that he was so frustrated with speaker technology of the 70's that Roger was basically forced to design a new speaker.

Quested might also give you that extra edge.

I am not sure where the idea that maggies and dynamics are not compatable. I recommend you try Maggie 3.6's and you will be surprised by the dynamics if they are coupled with the right amp....Jeff