It is not worth spending the money for the expensive stuff. If you are climbing over logs and wading all over the river you will just be disapointed when you rip your expensive coat.
Kind of like buying a Loomis rod, you spend most of your time worrying about breaking it and it just does not fish any better than many cheaper rods. Point is, go buy a set of Frogg Toggs and use them until they wear out, maybe 2 to 3 years and then throw them out and get a new set. They are light and breath and completely waterproof, they come with a money back policy.