Quality of travel vs. quantity
It seems that a lot of folks are fixated on the amount of travel that a bike has vs. the quality of said travel. Going with the longer plates (betd or dangerboy) is going to give your bike extra travel, bit it'll require a firmer spring (as smt and others have said) and it's going to mean that it'll be less supple over small stuff in order to keep it from bottoming off of big stuff. The extra leverage on the shock also wears them out quicker and generally makes them feel like pooh.... I put BETD rockers on my Bear and went back to the standard rockers after a year with a pushed shock and it rides so much better in all conditions.
FWIW, I've got a pushed Vanilla RC on an older 6" Stinky and that bike can handle anything I can throw at it. Given, I'm ~a buck sixty five with gear on, but it's handled 15 feet to tranny many times without an issue (north shore stuff). Darren Murphy from Push strongly advised me against longer rockers for my bike when I got my RC pushed a couple of years ago and I don't regret it a bit. Think quality, not quantity when referring to travel and you'll end up happier with a better performing bike.
Chers,
EBX