Well on paper the Kappas look the best(mainly due to the 2 ohm rating) but I liked the sound of the Momos best, but have not been able to hear the RF"s yet. Problem with K Perfects is that they do not come in 6x8, which is the size I want(might end up with 6.5 with an adapter).
The only nock on RF that I've heard(from someone not in person) is that they are a little more harsh than the other 2.
I am planning on running a Rf T212D2 off of a 25th Pwr 1000 so I would like the speakers to keep up.
But Phase 1 will be off of a HU(Alpine CDA-9833 with a RF Classsic 12/Punch 45.