I recently purchased the Canon 60D after owning a Canon Rebel for several years. The lenses I own are EF 50mm f/1.8 II, EF 70-200mm f/4L IS, EF-S 18-55mm f/3.5-5.6 IS and EF 80-200mm f/4.5-5.6 II. I am considering purchasing a new general purpose lens to be used both indoor and outdoor, people and group shots. Do you think this is a good idea or should I use the 50mm lens? Any advice would be appreciated.