Simms, Simms and Simms.

They sell probally the best selling wading boot in the country. The Guide Boot. You will have problem getting 4-5 years out of them, they provide a ton of support, lots of foot protection but arent overly stiff like some other high end boots. They are made out of a very flexible Nubuck leather.

I fish the Simms Lightweights and love 'em because they are super light and you can really cinch down around the ankle but they are for skinnier feet, wider feet tend to blow 'em out.