If you want a small one that's easy to lift, but still pretty stable for an average sized adult, the Spitfire from Emotion Kayaks is a good choice. I'm waiting for a delivery truck to bring me my second one today, as I got tired of cartopping the first one to my vacation place and left it there last summer.
It's about 8 ft long, so it yaws a bit more than the full size ones, but it's actually better for poking into the cuts in the islands since it needs less room to turn.
$250 from Cabela's, no tax, free delivery. At that price, you are not likely to find something used that's any cheaper.