tower defense type game AI

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ckob

I'm trying to make a tower defense game basically you have a level where you can place towers that will shoot mobs and the mobs need to detect each tower and move around the towers, what I was thinking of doing is having the mobs use 4 spheres place on the sides,front and behind and if one of the spheres collides then the mob turns to another sphere and moves in that direction however I think this might be slow once 30-40 mobs get on the screen. So can anyone give me any ideas on the AI for this? I thought about A* but im not sure if that will do it either...by the way this is 3d.