Are your RainBird 5000 sprinkler heads leaking after installation? You might want to clean out the lines and the head before jumping to a replacement.
Sean Stefan from Sprinkler Daddy ( http://www.SprinklerDaddy.ca ) talks about how to go about cleaning out your RainBird 5000 sprinkler heads and sprinkler lines to see if that solves your leaky sprinkler problem.