Soil Max sells Ag Leader, but you could trade your 750 for a FM1000 and use WM drain, as long as you have a good dealer.   When I went to GPS with my gold-digger, I used their brand, and ended up with 2 expensive monitors, and I really wish I would have just bought WM-Drain for the FM1000 instead and saved the money.  I have no qualms with the soil-max GPS system, however.