What are some suggestions for the most reasonably priced auto steer system.  I am running a Raven Envizio right now for guidance but now I want more.  This unit would most likely be for tillage/anhydrous application so WAAS is fine for me.  I know some people plant with WAAS and I may consider trying that while still using the markers.  So which unit is the best for me.  I don't want to spend 15K on this.  I want to keep it closer to 5K if possible.  If I could find a used system for a deal that would be great so if anyone kows of one let me know.  I searched online for used stuff and there wasn't a whole lot to come by.  I know there are lots of guys out there who have upgraded to more accurate stuff so tell me where all your used stuff went. 

 I know I could add Quicktraxx to my Envizio but that alone is around 5K new.  I was thinking along the lines of a used EZSteer 500 system.

Thanks,