If you ever wanted to own an Optima battery but thought they were too pricey, Optima has a sweet rebate going on for April: http://www.optimabatteries.com/en-us/news-and-events/promotions
Yes Optimas are expensive, but this rebate helps ease the pain. I have been very happy with the Yellow Tops I have in my camper and tractor. Zero maintenance, no corrosion mess/smell, and they hold a charge for a long time sitting idle. I have never used them for trolling motor batteries, but they carry a pretty good reputation for doing that job as well.