Almost any decent jonboat, barebones or decked, is what you´re looking for.
In my particular case, i went from a 1232 with 50lbs electric to a 1760 with 60hp. It has been awesome. Almost every day turns into joy. I could even invite my family!
The only additional recommendation, that has saved us multiple hassles, is to add a locking rear differential to the truck that pulls the boat. We have tackled slippery ramps, climbing uneven roads, and even undocking without proper ramps with the additional traction of the locker. There are some good differentials that are bolt-ons on the stock differential case, that turn the trucks into decently capable pullers; im talking about 500 usd.
When pulling heavier stuff, many trucks feel not very confident when adverse conditions appear. Most of the time, even with stock tires, there's a big difference with a rear locker.