Speaker with most dynamic PUNCH?

I guess highly efficient, large drivers will have the potential to 'punch' more so, since they can move more air with less power.

What that translates to in terms of the quality of the punch is another matter.

Not sure you will get a lot of punch with 2 ways, especially monitors. You'll need a big box.

As always, big sound with big quality costs money.

I think Marty McFly's guitar amp was pretty cool.

Almost any in the Tannoy Prestige range. And they are all two-ways.

Oris 150's with Lowther drivers a good bass cabinet.

Any ATC. All punch way above their size. As you correctly surmise, it boils down to large magnets with short coil in large gap and larger diameter voice coils that can cool effectively so that thermal compression is minimized. The other factors are a box tuned to be critically damped or over damped and a forward midrange (mids can effect our perception of punch).