Consider mirrorless rangefinder style cameras like Lumix GF-1 or Olympus Pen. For mac user, obvious choice is Lumix GF-1. Autofocus in video mode. shallow DOF. Interchangeable lens. No overheating. Very small body. Records in Motion Jpeg Quicktime for easy editing. http://vimeo.com/videos/search:GF-1/60495592