We also replaced the French doors out to our patio, and the sliding glass door out to our backyard. We decided to go with a French door out to the backyard as well. The doors are Low-E.
While we normally do everything ourselves, we decided to have a contractor come out and do this project- we knew it needed to be done right. I am so glad we did this as they ran into some problems. The supporting beam above the sliding glass door was rotted through and needed to be replaced along with some of the sub floor upstairs below the patio door. We would have been in over our heads a bit.
All we have left to do is paint them. Everything will be painted a nice crisp white, except of course for our front door. It took us 2 meetings and 12 colors, but our HOA finally approved a color that we like. What color you ask? You'll find out when we paint it! :)