I have a pair of Nashbar rain pants that use Gore. They have vented knees with over flaps, zippered ankles with Velcro wrap straps. I bought them on a whim about 10 years ago, they are one of the best purchases I have made.
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rain pants? waterproof SierraDesigns...cost about $25 on SteepandCheap a few years back. I wear them maybe twice a year riding. They're more of a backpacking thing.
neo. booties and leg warmers for me generally (with MTB shorts for style), although showing up to work soakin' wet can be tough for some.