Hello, My wife recently purchased a used Nikon D50 camera for her first DSLR. We got a great deal from a friend who'd upgraded. Unfortunately, since our friend upgraded, she kept the old lenses for the new camera and we didn't receive any lenses. For my wife's birthday I'd like to get her a lens so she can actually use her camera. We can't afford to get too many lenses right off the bat, so I am looking to get just one good, all purpose lens. So I guess my question is, given a budget of about $200, if you had to get just one lens for a Nikon D50, what lens would you get? We're not opposed to generic brands as long as they work fine. Thanks!