I'm about to enter the AF100 world for editorial multimedia shooting. I anticipate controlled settings, not chaotic demonstrations, but need to be prepared. I'm looking for the best lens configuration, starting from scratch--and am definitely not rich. I'd love to work only with primes, but that seems impractical given the nature of my work, so will need fast zooms and autofocus. My only concern is whether you can hear autofocus (like image stabilization) on any lenses that are mounted. Am I being paranoid? Suggestions?