I have some waterproof Sombrio downhill mtb pants that look like 'normal' pants but they trap moisture (not breathable) and the waterproof lining makes the pants kind of noisy. Waterproof or breathability; I would rather have breathability.

You could try some of the Swrve pants. They looks sort of normal though pricey.

http://www.swrvestore.com/servlet/Detail?no=107