Speaker with most dynamic PUNCH?

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).

go with larger models with larger drivers ofgood quality and design and the rest is personal preference and a suitable amp with enough juice to max out
performance.