This Skyline Panel track system from Hunter Douglas is the perfect choice for a very large condo window.

Vertical blinds done on a curved track to follow the curve in the window. Notice the height of this beautiful window.

Hunter Douglas Architella cellular shades. Can be customized to fit an arch top window and can be operable as seen here. They are very versatile in that you can open the arch up or leave it closed. Architella is a very good insulator and comes in a variety of colours and fabrics.