If you don't think you need universal sonar built into the TM, I would recommend saving some money and going with a Min Kota Power Drive V2 or Edge. Also, if you plan on half days or longer on the water, with a 17 series v-bottom I highly recommend bumping to 24v 70# unit.
The other consideration that is critical to think about is ease of stowing and deploying. I've owned the PD V2, and they can really be a pain in the butt to deploy and stow. If you are getting a little older (like me) or have any kind of back issues or just don't have a lot of patience, you may want to look at the 24v 70# Edge instead. The Terrova and Ulterra are quantum leaps ahead in ease of deploy and stow, but they will cost significantly more and include features/functionality that you won't likely use.
I hope that helps!
Good luck!