The Shimano A520 mentioned by AndrewP is what I have on the hybrid. I like it, and can get in and out without problems. Having the platform on one side is an okay option on that bike. On the other, double sided would be better.

Actually, I've ridden the touring bike with street shoes, and it was not uncomfortable. That M424 sounds like the way to go. Pedals of any kind stretch the budget right now, but separate shoes and cleats for each bike are totally out of the question.

Thanks everyone, for the specific answers.