Unless you're looking for something to take on/off for stream crossings, I'd go with stockingfoot chest waders. Another great reason: you can turn them inside out at night to dry, and even throw them in the washing machine. And, I know some can be rolled down and used as waist-high. Bring a set of socks that'll work with your wading boots and a light pair of pants if the weather ends up being hot and sunny.
A lot of people will recommend Simms G3/G4, so far I've had great luck with the new Orvis Pro Waders, and they just released a zip version. 5 layer on the lower legs for durability, very comfortable. Haven't used them a ton in warm weather though.