I've been a backcountry ranger and field ecologist in Alaska for years. I've tried just about everything and pushed it to the limits of endless rainy bush-whacking.
Realistically, you may need two sets of rain gear--one rubberized super-waterproof and camo like the Helly Hansen gear or some others that have been suggested, for times when you are sitting in the rain, on a boat, etc.--and one for hiking around, backpacking, and bush-whacking+.
That being said, the best rain and snow gear I have found in the world is the Arc'Teryx (models Theta AR). They are expensive, although you can find them for almost half-price on auction sites. You need the 3-ply Gote-tex (called Gore-tex XCR or the new stuff is called Gore Tex Pro Shell).that has taped seems and no inner liner (the cheaper stuff is not nearly as good)...a few other companies make them as well, like Patagonia, Mountain Hardware, and Marmot, but Arc'Teryx is as good as there is, and I have battle-tested this...it's lightweight, ultra durable, super breathable, and as waterproof as you can find in a breathable material...almost as good as rubber and will last you years, and then will be replaced or repaired for free when it fails. Unfortunately it doesn't come in camo, but there's a black and a brown, and this is the kind of raingear you love every time you put it on.
http://arcteryx.com/product.aspx?Theta-AR-Jacket