After trying a few things, I decided to design my own out of a discarded plastic bottle and a waterproof gaiter (description and directions here).

As for rain gear, I use rain pants when it is a real downpour and cold. I have a thin rain shell that works OK expect in a downpour. To keep from sweating too much, look for pitzips and velcro on the front so you can secure it but have most of it be open for air flow. Rain pants + rain shell = soaking sweat