Originally Posted By OregonMouse
Feathered Friends will make you a bag with an eVENT shell, which is more breathable than other waterproof fabrics.



I believe that Feathered Friends only offer the eVent material on their Zero degree and below bags-- which is a little overkill for the OP's expected temp range. However their Epic shell is just as good IMOH, and their +20 and +10 degree bags costs less than the ones the OP is currently looking at, but are much better quality.

I own both a +20 Swift and a -25 degree Peregrine and they are top of the line quality sleeping bags, and without a doubt I would purchase both bags again in a heartbeat.