QUAQUA - You made a very wise decision by going with the poly pipe here in Michigan, because the bottom line is, the weather IS going to be a factor. Up here in northern Michigan that is all we use. On certain occasions we will use PVC for the main line, but its rare. If you are still looking for advice on what parts to use, I would personally suggest the Hunter products. The PRO-C is a very nice controller, the PGP rotor sprinkler heads are excellent, and whichever Hunter valve to suit your particular needs, I have had good experiences with all of them. Good luck on your project.
Tony
Tony Posey
Ridge Run Landscapes