Rain Gear I have used:
Helly Hansen Impertech: 100% rain proof for hours on end. I eventually start to get wet up my arms though. This can be fixed with a strip of duct tape around the wrists. Kind of heavy and doesn't pack well.
Marmot Precip: Very good. I will say that it is 100% waterproof but fragile. packs very small and light.
Cabelas Space Rain: Never got wet in it but it now has holes in it. This stuff is single layer and very thin. Packs down extremely small.
As far as I am concerned breathable and waterproof shouldn't go together. I understand the theory that water vapor is a smaller molecule than H20 and therefore creates a one way valve so to speak. I will stick with PVC until someone can prove me wrong. I really want to try the new Kryptek Gear. It was designed and tested in Alaska, in order to pass the test it should be good.