Most of the paddle web sites have a guide or chart to pick a length based on your height and the width of your kayak, plus whether you're a low angle or high angle paddler. Werner, Bending Branches, AquaBound are good.
I have a pair of AquaBound Manta Ray Posi-Lok paddles and really like them. It has a broad blade for high angle paddling, weighs 29.5 ounces, and is right at $200, which was my price point. The AquaBound Sting Ray has a narrower blade for lower angle paddling. YakGrips are a great addition to a paddle.
Neumie has a ton of info in this post:
Here.