The 18-55 should be wide enough for most of your needs. Stopped down it is pretty sharp, not L quality but not too bad for a $100 lens. With the crop factor it has the field of view of a 29mm which is a nice wide angle. If you feel you need wider Sigma makes a 12-35 full frame lens, it's not cheap though. If you are dissappointed with the 18-55, the 17-40 L is a great lens, but it is expensive at $700, and it doesn't give you a much wider fov. I personally have the 17-40 L and like it very much.