I have an outback slicker on my list of gear to get for spring. It'll also be handy around the farm when the weather is wet and I have to work outside anyway. The Mrs. Has one that she wears for riding and farm work and it's great.
I haven't figured out what to do about the helmet/hat issue. I ALWAYS wear a leather, wide brim, hat when I'm out and about--it keeps the rain off of my glasses, not to mention my neck. I need to find a good option that has the functionality of the hat but the protection of a helmet. 'Course, I haven't exactly looked for such a creature, yet!