Coosa's are an easy sale, I actually seen a guy looking on Craigslist locally for one the other day. For larger waters I love my Hobie Pro Angler the downside is big and heavy. The Native Ultimates, and Wilderness Systems Commander 120 and 140 make great lake and slow river boats also. The Commanders have a low seat and perched seating area. They are more of a canoe/hybrid style kayak that allows to pack even more gear.
One thing I forgot to add. The seat on the Wilderness Systems Ride 115 is a special type seat that adjusts forward and aft depending on what type of water you are in. Whitewater move it rearward so you can turn the boat quicker, or flatwater move it forward to get more of the nose of the boat in the water for faster travel (cuts thru the water better). If you want to stand move the seat rearward for a larger standing platform. The seat on the Ride 115 sits lower so it is more difficult to get from the sitting to the standing position than the Coosa. I haven’t done side by side tests to compare stability of both boats, but both are supposed to be very stable.
Here is a video to show you the stability of the Coosa. The guy in the video is Chad Hoover co-owner of Hook1 in Hendersonville. He is at least 6’3” and I’d say over 250lbs, so larger than the average guy. I’ve found that kayaks act more stable with lighter and shorter people. I have a Coosa and have fished side by side with other people that were 60lbs lighter and 4” shorter than I and they can do some crazy stuff on the Coosa.
http://www.youtube.com/watch?v=RAjOS-SX4Kc