I have a Helium, which is great as a rain jacket. Just not breathable or packable enough for me to use as a wind shirt.

I unstow/don/doff/stow my wind shirt pretty often so it needs to be very stuff-able and ready at a moment's notice. Usually, I've got it in a pocket that I can reach without taking off the pack. In fact, one of my winter-time sale purchases was a wind shirt that has no back. It pulls out of a waist pack and is built to be put on over the pack straps and around the waist. That's the one I was thinking of trying extra DWR on.