I agree with the folks on this thread that the System 6 urethane is the best stuff around, but the kit with colorant, hypalon primer, and accelerator, will put you back quite a bit for an old campways. I would also add that if you go with urethane you will need some decent shop space where you can work on it and let it cure. I would highly recommend a good organic vapor respirator as well (I am not kidding, urethane is nasty). If you do spend the money for urethane you will want to be meticulous about your prep job. You will need to chase down any leaks first and sand the whole boat without going too deep (I use power tools, but if you are not comfortable with them it is easy to go too deep). It is expensive, and labor intensive, but if you do it right, it really does bond to your boat.
Or, DIB still sells the Hypalon neoprene paint for $88 a gal: Inflatable Boat Solvents and Paints
I would trust anything DIB sells to be a quality product, but it probably wont hold up like urethane.