Hello all, my boss is looking for a general purpose indoor lens, but doesn't want to spend the money for an L lens. Any recommendation on a mid-grade lens for indoor pictures without using a flash? Mostly he'll be taking pictures of his family indoors during the day time. He does have the 580ex flash, just incase. He will be ordering the lens along with the 20d and wants to be sure he's ordering the right lens for this purpose. Thanks!

