I emailed Minn Kota this weekend and this is their reply

Thank you for your email. The 60amp breaker purchase price is $39.99 plus $9.40 shipping.(this is what we sell them for).A 50 is ok but we recommend 60 for the higher motors.
pas
I have not installed the trolling motor yet

I bought the 50amp circuit breaker at Tracker Supply at Bass Pro in Garland for around $9.00 and they did not have the 60. It is the small one that just hooks right up at the battery with a reset.
I got the second battery this weekend and it is in and ready to hook up. It is the Maxx-29 from Wal-Mart (Same as the exising battery.) I like the way it held up so I bought the same thing.
I have an exiting 12V trolling motor now. It is an old Force/MotorGuide 12V.
Mr Ridgeway said the wire and plugs on the existing 12V trolling motor should work for the new trolling motor because 12V generally draws more than the 24V.
I have a friend that is going to help me install it but I am waiting for some warm weather

He is a very nice guy and does not take to cold weather all that well
I also bought (Well my wife bought it actually as a gift with her bonus

) the new Hummingbird 597CI with the new Navionics 2009 Hot Map and I need to install it. My brother in-law is suppose to help me with that on Wednesday. I bought the ball and socket mount and I want to try and install it right near the drivers seat.
My wife and I are excited and want to get them installed so we will be ready to hit the lake and test it all out.
Thanks for all you help!
If you want to help us out I wouldn't say no ROFLOL