There's a new window out now & ready to go into your house. The latest window type to be included in the range of window materials is a combination window that has an Alum. frame on the outside & uPVC on the inside. Could be worth looking into if you like the Aluminium look but are tired of wiping condensation from the window frames and don't wish to pay extra to have uPVC windows. They don't come in the tilt-&-turn range that the traditional uPVC windows do.
They will be something for us to look into for our next development here in Westport. I will keep you posted on our decision & why we made the decision we did.