Tracker makes a stick steer called the Panfish 16. If you want something a little cheaper they have the Pro 160. You made a comment about wood decking, if you take care of it, it'll last you 20+ years.
I had a 14' that had 25 year old wood on it. It was still good and firm when I redid the boat. Leave it outside in the elements all the time and you're right it won't last. Don't be afraid of wood and don't be afraid of getting it wet.
Those 2 boats are about as cheap as you'll get new, unless you go the john boat route.