are you a new rider. well the facts are those bikes are just plain bigger then yours so yes they will kill you. what are you looking to do, drag, race coarse, street ride? if its drag forget it, on the race track you can keep up in the twisties, but as soon as a striaght comes they will be gone. on the street, well you shouldn't be going more then 100mph anyway on the streets. so you can keep up easily there.
street racing is for ametures and children, save the real racing for the track. either of these 3 bikes would be awsome so have fun and keep the rubber side down