Something else to consider is a non waterproof/breathable material like silnylon/silcordura.
I have used the old OR lobster claw rain mitts, the current Paclit Latitude shells and some other OR Gore-Tex shell that I can't remember the name of. In serious, prolonged east coats rain, they all eventually leak. Too many seams, or the fabric wets out. In my experience, DWR simply can't last against the constant abrasion of mitt use.
Given that I have poor hand circulation, this has left me with numb, almost imobile fingers in 45 degree rainy weather.
My solution has been two pars of light liner gloves and silnylon stuff sacks. My favorites are Granite Gear's silcordura #3 sacks as the material is less slippery than other silicon coated nylons, yet is very tough and the stuff sacks are easy to seam seal. My hands get slightly damp from persperiation, but it is a warm damp. The fabric does not leak, does not wet out and the sacks are multi-purposeful. I just switch out the liners every day or few hours, drying one pair against my body while hiking.
Anyway, it is something to consider, especially if you already have the stuff sacks. Sorry if this was off topic...