The few irrigation system quotes I got were all over the place. $4000 - $7000. They all used similar equipment and all spec for 8 zones. Actually, the lowest quote does Lots of work in my neighborhood and is always around. They also spec'd significantly more heads than the other quotes and design for head to head coverage (32 ft spacing). Anyway, my municipal supply varies all over the place. Current readings are 42-45 psi statically, but last summer they were around 60. I am having the city look into this, but no success yet. None of the contractors recommended a booster pump, but I don't know how they plan to run 6+ heads per zone on only 40psi. I have a 1inch supply, 3/4 through house and 5/8 meter. I have a non-restricted utility faucet coming off a 1/2 inch line and I got 12 GPM. If I end up doing a booster pump, I was thinking variable speed would be the way to go, then I read on here that Davey Torrium is recommended. Thoughts on controller base vs. Flow switch base? http://www.torrium.com/categories/Davey-Water-Pumps-with-Flow-Switch/ I was originally looking at something like the Goulds Variable Speed Constant Pressure Booster Pump. Additional thoughts or info I should look into? Thanks.