IMO, Goretex is hugely overhyped and has been surpassed by more modern approaches to shellware. The Buffalo and Paramo products are good- I use a Paramo varient for my waterproof jacket. However, they will still be too warm for high exertion.

So long as it's not actually raining, I'd highly recommend Marmot Driclime (or any of the generic versions made by REI, etc). Treated with Nikwax fleece waterproofing treatments, I've found it to be waterproof for even heavy rain, so long as I generate a lot of heat.

If you are interested in the wool option, Ibex is one of the companies making high performance woolen garments for outdoors use.