Well, I got an Evlution II and its great. You dont really need a fast hopper like an evlution or a halo, unless you got a fast gun. Most other guns would work fine on a revvy.
whats the best....in terms of rate of feed....halo B no argument
whats the best for you with your marker, well that depends on your marker...there aint much point having a halo that can do 22 bps if your marker is a spyder and can only do 13