That is a good choice for what you are building. Even when slowed to 850-1000 rpm,it will deliver over 10 gpm @ 200+psi. That is a bunch of noozles @ 45psi should you decide to put a pasture boom on it.
Good little pump. If you're spraying Glyphosate or other chemicals, I'd recommend getting the Silver Series. They'll last longer, and have better seals and rollers. Here's one on eBay: