KRK Rokit monitors are okay for their prices, but really, they are not highend. I think a pair of Manger MSMc1 could possibly compete with the Vapor Cirrus.
Theoretically, an active Vapor Cirrus could be incredible, I'm not saying that it couldn't be. Vapor Sound doesn't make one. In a challenge against actives that do exist, Event, Genelec, Adam, etc, my money would be on the Cirrus every time. It's incredible, one of the best speakers I've ever heard, and I've heard stuff that costs $200K.
Active crossovers and bi-amped drivers are not magic bullets, they don't make a KRK Rokit sound better than a Cirrus or a Merlin TSM, or even much if any better than a comparably priced passive speaker from somebody like NHT. It's just one way to do it.