I'm considering having an irrigation system installed. I've been quoted by someone who is highly recommended to install a 6 zone Hunter system for $3,600. I think the price seems reasonable based upon what I've heard from in the Raleigh NC area. Do you agree? Also, I know nothing about irrigation systems. What sort of questions do I need to ask? Are they certain options that should be included that I need to ask about? Is the Hunter system a reputable brand? Thanks!