My personal preference is the NRS Gig-Bob, funny name great toon. They are hard to find used, (The originals built from 2009-2011, sold new just North of $1700) They just came out with a second edition and it sells at just under $1,000.
This boat can be used on rivers, with proper experience and ratings in the 1-3 range, I use it exclusively on the lakes with a 2.5 hp Suzuki. it handles well with the Carlisle oars it comes with but the motor makes it a go anywhere toon in almost any condition, again consider your boating experience when I say any condition. I have fished all 3 South Park lakes with this toon 100+ days a season and it has never disappointed me.