Hi there,

Although I would agree to many of the posts recommending the high end lenses, either prime or the f2.8 pro-zooms.
I find it in particular useful to have a long-range zoom (14-150 etc) for traveling. The photo taking opportunities change in unknown places so dramatically that I find it a bother to have to change my wide to a tele for example. Still useful to have a fast prime in your bag...
Cheers Moxi