A few years ago I was looking for a chair to hold my big butt, that would last more than a couple of trips out. (I weighed upwards of 450 pounds at that time.) I didn't care what I had to pay, I wanted me one tough chair. I found the Maxx Daddy chair. It was tested to hold 1500 pounds or so, I believe.
Granted, it ain't exactly a light weight option, but for comfort and strength there is none better. I have used it for everything from just relaxing on the porch to fishing on the river in sand, rocks and mud. The color has faded a little, it ain't as pretty as when I first got it. But it is as sturdy as it was the day I bought it. I love it.
Check it out here:
http://maxxdaddy.com/