How near are your fields to each other? You could have your own base station for what you pay to a dealer network pretty quick. 

Dealers here haven't had radio/base networks for years and years. Everyone is on cell, SF-RTK, or they have their own bases and radios. Whatever works best for them. 

Are you doing any tiling or ditching? Or just steering row crop machinery. 

How is cell reception in your area? Lots of options and a 6000 w/ RTK is still very good. You can buy the whole 6000 w/ SF3 and RTK ready for WAY WAY less than ever before right now