Which Forte is best for biamping?

I have a variety of amps and a couple of active crossovers. I want to do some amp rolling.



One amp will be doing tweeter and squawker, another doing the woofer.

The crossover between the tweeter and squawker will be passive.

There will be a sub getting signal from the woofer amp's outputs.


Should I pony up for Forte threes or fours or would I be just as well served with OG Fortes?