Rivers or Lakes? How much gear do you plan to haul (canoes haul more than kayaks). Got a budget in mind?
I suggest you try a few out before making a major purchase. Caney Fork Outfitters carries the full line of Jackson Kayaks (made here in TN). Hook1 in Nashville has Wilderness System and FeelFree brands (imported). Both stores have great staff and can set you up with a few kayaks to test paddle.