I really like the StreamCam so far, and I would say it's probably the best camera on the market right now for all-purpose video usage (not quite as expensive as the top tier, but 95% of the way there in quality; better looking than the C920/30 webcams you see around a lot of offices).
Ditto on lighting though. I don't use any kind of video-specific lighting, but just putting more lamps on my desk has made a world of difference. And I think the backlighting effect also makes my monitors less stressful on my eyes.