I am looking to buy a bow-mounted trolling motor. I have an older Minn Kota on the stern that has worked well. I am just looking for something that will be reliable; it doesn't need to be fancy. I see the more economical Minn Kota's like the "Edge" and "Power Drive V2"; they look better for the budget than the "Terrova" and "Fortrex". Would one of these fit the bill, or is there a MotorGuide model to consider? I will mainly use it to work around standing trees and submerged cribs. Any thoughts would be appreciated. Also, what's the best way to determine the shaft length to order if it's the middle of the winter and the boat is on a trailer? Thanks.