Re: 16 foot pontoon boat
no real drawbacks for the use you specified...but, i had 16 footer and it always seemed like my 2 person cruise (my wife and i) turned into a 6 to 10 person cruise once friends found out i had a pontoon boat. At that point, it was simply too small and unstable for that big of a group. As long as you're sure its just gonna be you and the wife (maybe another 2 to 4 friends) you'll be fine. If you think you might find yourself with a sudden rush of new found friends due to the aquisition of a boat...go a little bigger. My 16 footer pulled just as easy as my 20 footer did. This is just my opinion, but one that may be worth thinking about. The people here on iboats.com are great and have helped me greatly in my short time here....good luck with your search for the perfect toon'.
Happy Boating