If you can get your hands on them, I would suggest two zooms: one in the wide-to-normal focal range and the other in the longer focal range. Between the two zooms you can cover as wide a range of focal lengths as you think you will need. If it's only prime lenses you want opinions on, I would go with the 24/2.8, 50/1.4, and the 180/2.8. All three are very lightweight.