As I read through the various threads and learn from you Pro's, it seems there's been a bit of debate about the use of Rainbird 1804 vs 1806's. One guy says......use 1806's while others say 1804's. I live in Central Indiana and my lawn is Kentucky Bluegrass/Perennial Rya. To better protect from weeds and the summer drought, I tend to keep the grass quite tall...especially in the summer. Well, I'm finally going to break down and have an irrigation system installed. The questions are.....should I use 1806's or 1804's with MP Rotator's. I intend to go entirely MP R's using SAM-PRS bodies. My concern is the taller grass interference with the MP "streams" if I use 04's. I've read/seen that the 1806's are a side entry which is said to be problematic for reasons I'm not sure (perhaps winter blowouts....SAM issues??? Does Rainbird make an 1806-SAM-PRS that is a "bottom feeder" like the 1804??? Help settle the debate. What are the differences....and thanks for your input.