Lugging around a kit like that would probably make me feel self-concious, too! I usually street with a 50mm f/1.8 or equiv, sometimes a 28-105 if there's good light. I imagine our goals are different, though. Still, it wouldn't be a bad idea to lighten up your kit. I don't believe I've ever come back from shooting thinking, "I wish I had my 70-300 and floodlights with me!"