When it comes to trolling motors, simpler is better. If it were up to me, I'd opt for more power over the 3x steering or a foot control. I would, however, consider a quick release mount. I would get one of these vs the minn kota. It is sturdy and only leaves the two aluminum pads on the boat.
http://www.iboats.com/Swivl_Eze_Trol_Lock_Motor_Mount/dm/session_id.781383660--cart_id.012024545--category_id.238347--list_time.1199138934--view_id.3950
I would also recommend an extension handle...saves your back!
http://www.basspro.com/webapp/wcs/stores/servlet/Product_10151_-1_10001_1208_200002004_200000000_200002000_200-2-4
I am a dealer for Minn Kota if you have any other quesitons.