My Fractal Design S is a great case don't get me wrong but I always have liked the look of the Corsair Air 540. It has great airflow from what I hear and also great cable management. I like the box design of it and everything included with it. What are your thoughts?
No one can make that decision but you. Besides, anything anyone might have to say is going to be purely subjective. Take the two case specs and compare them side by side. Finally, factor in aesthetics if that matters to a great degree and then decide if it's worth buying a new case or not.