Sit-on-top kayaks are way too unstable for large people, but they're meant for people at the beach who want to fall in the water anyway.
Tried two sit-in 'recreational' kayaks, OK but still wobbly.
Necky Kayak's Manitou 13. Five more minutes and I would have married it. Good fit, good stability, nimble. Not too sure about the cup holder, but WTF. And kayaks don't strain your knees the way canoes do.
Also tried a day-excursion model with a little rudder that flips down on demand. Could be very handy in windy situations, but at 15'. more than I really need.
Came home hot, tired, badly dehydrated, was worth it.