Blake: First welcome to the TFF! Lots of knowledge here, and many will share it with you willingly.
Big question here is whether you are planning to couple your electronics to your trolling motor (tm) to use "Spot Lock" or "Anchor mode"!
Since you have Humminbird - if you are planning to hook it up to your tm then I think you are limited to Minn Kota. I have not heard many good things about how well the Minn Kota holds on structure using "Spot Lock". So, if you are mostly crappie fishing structure - AND you are planning to couple your electronics with your tm, then you are locked into MK.
But, if you are considering switching to Lowrance, then the Motor Guide Xi5 is the way to go! I've seen it in action and it holds on "target" the way you would want!
So, good luck with your search - and enjoy the learning process!