WaveSport project 45, Jackson Kayak Star, Bliss-stick Smoothy, Dagger Agent 6.1, Dagger Kingpin 6.1, Liquid Logic Vision 44, Liquid Logic Ronin 49, bliss-stick Specialist, and Bliss-stick RAD 175 or 180
If you want a boat that's more challenging and specialized go with a Riot Flair 47, Riot Astro 54, or DragoRossi Squashtail..
Those are the boat Manufacturers I know about, The first 4 boat's I listed would probably be the best suited for you, as I know for a fact that they are easy to manipulate in flatwater. There are a lot more boats out there too, so I would pa-rouse the other threads about playboats. See what's available to you, and see what you can hope in to demo, whether from people on the river or the kayak store.