Yeah, gargoyle type that can handle and get you through those 30ft jumps. Witch brakes are for xc only, as those brooms are not stiff enough for dh.
On a serious note, my vote would go for, in order of preference, Shimano Saint's(or XT, of course with 8inch rotors), Avid Juicy's, Magura Gustav. Gustav is the most powerfull, but heavier / expensive. Also if you can get a hold of the old Shimano 4-pot XT, your good to go.
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