I mostly just use softshell pants when riding in the rain - they're water resistant and that's usually good enough. They're stretchier and more breathable.


But for stretchy actually waterproof rain pants, check into the patagonia spraymasters - I have a pair of those and really like that they're tapered, stretchy, and full zip...

But generally I'm not really really riding in the rain, so I can't say I've given them a good test other than it's raining and I'll bike the few miles into work.