Hi, I've got a Panny Gf3 w/ Panasonic 20 mm 1.7, Olympus 45 mm 1.8, and 14 mm 2.5 primes. I'm going to Australia in February and I'm wondering if I would be well served with another lens. Specifically I'm curious if I should look into a zoom lens, but I'm not sure what range would be best. I don't think getting a lens starting at 100 mm is smart, but I wouldn't mind getting something with 100 at (or near) the upper end. I think it would be nice to be able get through a day carrying one or two lenses.