I think those gloves will work pretty well for you down to a certain temp. You'll have to find out what that temp is. I would still recommend a windproof shell to carry with you on the colder days.

Ya, you got to get a decent cycling jacket for winter riding. Absolute must. Then you can work on the feet. A cheap solution to help keep your toes warmer that works with cycling shoes down to about 45 degrees F is to duct tape over the toes to block the wind from coming in. That is if your using cycling shoes. You can also use clear vinyl tape as it doesn't look so corny but it may not stick as well as duct tape.