The seat is the most important part for the casual enthusiast. If you are uncomfortable then even the prettiest river trip will become a bad experience.
If you are not too far ( I see you are in NWI) check out Fluid Fun in Bristol, IN. Kayak and Canoe sales in Bristol Indiana at Fluid Fun. They are great and can get you set up for what every you want and are relatively reasonable.
They are right on the St. Joseph river and will let you paddle different boats before you buy.