My opinion is that Hunter has the best parts and warranties in the industry, hands down. The Hunter ICC controller would be a good bet for a large system, and the PGP or I-20 rotor sprinkler heads are excellent. The I-20 heads have a five year warranty. Any of Hunter residential valves are a safe bet as well. That is all I install, haven't had any complaints yet! Good luck with your system.
Tony Posey
Ridge Run Landscapes
