Do you need a WSD bike? My wife has the frame of a guy, WSD's aren't always needed.
Test ride all ya can, make sure they have rack/fender mounts. If you want a smooth ride or more grip in foul weather, ability to fit 32C or wider tires + fenders is a good idea. If you're not bringing it inside, keep the price down, nice bikes run a high risk of being stolen. Also, avoid suspension, on cheaper bikes it's more of a safety risk (bike nose dives under braking) and adds useless extra weight.