That burley link is worth it for the picture at the bottom.

As far as waterproof/"breathables" go, I have found jackets made with goretex paclite to be best (in terms of breathability). I don't really mess with anything waterproof in the summer, it feels better to just get wet. For cooler weather, I have a moonstone "nemesis" jacket I found on clearance online. Most of the less expensive proprietary membranes breathe in a manner I find, well, sucky at best.