heh, i've actually had a ball bounce right off my lens.. it wasn't even an angled shot, it was dead on, and it just ricocheted right off.. it was some real bad severe paint, not that all severe paint is bad but this was just aweful.
anyway, bakc on topic.. i'd stay away from zap sport, diablo heat, marbs (they're hard!), zap rec-series (i'm not sure if it's different from sport), blue streak, any brass eagle stuff.. umm.. that's all i can think of right now of very bouncy paint i've used.