Any of the Godfrey products would be ok. The Aqua Patio is the best value for the $$$$. Sanpan brings lot of extras, but cost many $$$. Sweetwater is entry level and I doubt if you will be happy with it.
I have and still owe Merc Honda and Yamaha. The Honda is best for pontoon. Quality, quiet, warranty cannot be beat. You should be able to negotiate a good price at the show by comparing dealers. Good luck.