I would recommend you look at the Nissan 9.8 Four Stroke - it is a fabulous motor. Cabela's has them for $1,749.00 with no tax and free shipping - and even better, they offer a six pay with no interest with a credit card (VISA, Discover or MasterCard only). Four stroke motors are quiet, fuel efficiency, don't stink to high heaven, etc. Obviously, you aren't going to "fly" with a 9.8 on a jon boat - but you will move along quite nicely if properly loaded and balanced.
FYI - Current market price on a one or two year old 9.8/9.9 two stroke is $1,200 to $1,300 - IMO not much savings considering you are getting a lesser technology, less warranty and who knows about the care exercised during break-in and daily use.