Best lenses for Canon 60D
The best walk around lens is Canon EF-S 17-55mm f/2.8 IS USM. This lens is very sharp with constant and large aperture 2.8. The three stop image stabilization allows to take photos at low light. With the 1.6x factor, Canon 17-55mm corresponds to 27-88mm in a 35mm camera.
The best telephoto lens is Canon EF 70-200 mm f/4L IS USM. This lens is extremely sharp. It is relatively light (700g) with 4 stop image stabilization. Highly recommended! Other choices include Canon 70-200mm f/4L USM, Canon 70-200mm f/2.8L IS USM II, and Canon 70-200mm f/2.8L USM.