I'd say the CCM one, my cousin also has one on his shocker, and it's very nice, but another one you may want to look into is one with an arm clamp feed, instead of just the allen screw. I know the CCM's will fit the Halo without any shaving (and an egg will fit too, I tried), but I think the Trinity T-Lock clamping feednecks
here It may be easier to get in and out without an allen wrench.