What is a good sit-on-top kayak for the lowest price?

I just need something simple that I can take to the spring river a few times a year and do the 10 mile trip down the river. There are no serious rapids or anything, its simply just a nice lil float trip. We go so much though, I figure Id save money buying one, than dropping 50 bucks to rent one 5 times a year. Ive been looking a Lifetime Calypso 90109 model, and the Coleman Drifter. Im 6' and 220lbs, can I fit into these boats?