Buy a minn kota. They are far better than motor guide in my opinion. I have used several types of both brands and the minn kota performs twice as good.
i've used minn kotas for close to 30 years, and have nothing but praise for them...and they've gotten better and better every year...
i have a minn kota maxxum (12 volts/50 lbs thrust) on my boat and have had ZERO trouble out of it in 4 years....you can't beat it with a stick....and i punish it...
If space for the foot controller is a concern, I have one of the Minn Kota models with the small electric direction pad. It works good for me. It is not as precise as a cable driven model, but on my small john boat, it works great. It does have an electric motor that turns the shaft, which does use up battery, and make a little noise. I have 3 Minn Kota's, and I don't have a single complaint.