I have a couple of Nova Craft Royalex canoes that I use for river paddling/fishing/camping.  Both are 16'.  One is the regular Royalex and  it weighs >60#....seems like 2800# if I have to carry it.  The other one is a "lite" version and I'm thinking about 55 # or so.  They've seen plenty of rapids and countless rocks and have held up very well over the years.  They're bombproof but heavy.  I would have destroyed my kevlar boat many times over if I used it like the royalex boats.  If you can find a decent royalex boat that might be a good idea. 
My wife's roto molded kayak has also held up very well.  But guess who gets to carry all the "stuff"?  Yup, the sucker in the canoe.
Stay safe......