I'm going to be going to Vegas for a week and I'm thinking about renting a lens to take with me. Renting a fast zoom seems like the think to do - though not sure which would be best. Here's what I've got now: Camera - Nikon D80 AF-S DX Zoom-NIKKOR 18-135mm f/3.5-5.6G IF-ED AF NIKKOR 50mm f/1.8D Sigma 100-300mm f/4.5-6.7 UC Between the two zoom lenses I've got pretty good coverage though both are slower than I'd like to do street photography at night - which I imagine will be the bulk of what I'll be doing. What do you think? What's the best lens for this trip?