We live just north of you in Hiawassee and have a pontoon boat on Lake Chatuge. It's a Sylvan Mirage 818 CRS. Has a Yamaha 60 hp high thrust engine. 18' 9" in length. It's perfect for me and my wife. I don't see any reason why I couldn't fish out of it if I wanted to. With the bimini top up it would make it more of a nuisance. If your intent is to primarily fish from one, I would focus on the models specifically designed for fishing as it would make it much easier since most would come with a live well, fishing seats, etc. As for power to pull a tuber, with just one person driving our boat, and one on a tube, our pontoon could probably get 13/14 mph. I wanted a 90 hp when we bought it three years ago but the max hp rating was 60. If you want a 90 hp engine you might have to go up to a 20' pontoon to get the 90 hp rating or get one our size with triple tubes which increases the price of the pontoon but would increase the power rating. And I can tell you that the two new boat dealers in Hiawassee have practically no new inventory and just an occasional used boat on their lots at this time.