any avid mech brake... hydro's are too much trouble... the amount of trouble is justified for a DH/FR bike where you need the stopping power... but it doesn't make sense when a simple mechanical brake will do... on that note, i too would go with an Avid BB7
Anything cable. Not hydraulic as you dont need the stopping power of a hydraulic brake! Its a waste of money. They're great on DH bikes, but thats it. I would say the Gusset Chute. Or one of the Avids