I've been using the Outdoor Research Sojourn rain jacket for a couple of seasons now.  One feature I always look for are pit-zips because I do tend to overheat when operating with a load (e.g. portaging), so I'm looking for ventilation.  Well, these pit-zips run from the biceps down to the hem and zip in both directions.  And the product will keep you dry in an all day rain.

Although I paid more it looks like   (You need to Login or Register currently has them on clearance for about $75 (with free shipping).