Jerry, depends on your terrain and crop residue. If you are strip tilling into stand corn stalks you really don't "need" any guidance at all. Just put the tractor tires on the old corn row and go. Same thing if in a 30" corn/30" row bean rotation there you always drive on corn stalks. The best place ot make strips in rowed beans is right down the top of the old bean row. Stripping into corn stalks we always make the new strip between the old rows.

RTK guidance is nice however in that it reduces stress etc but not really necessary if you have good harvested rows to follow. You will find the planter really wants to follow in that strip. RTK is also useful on other tools. I sometimes suggest folks start with a mounted Pluribus bsar half the width of their planter. Then take the eqwuipment savings and put it into guidance. BTW I do not feel the cheaper less than RTK systems are close enough for most strip till applications.

This also brings up the important point that next years strip till begins this fall at corn harvest.  If you are stripping corn on corn we have found that a very good system is to run a cornhead with knife rows as high as possible leaving a 12" tall or higher stubble but chewing up the upper part of the corn plant into small pieces and leave them in the middles. Being in contact with the soil the pieces tend to break down over the winter.

The tall stubble keeps the rest of the residue from blowing away over the winter. And the taller stub left pushes OVER not into tractor tires when you drive on them while strip tilling in the spring.