zuluclayman

DivX or Xvid will give you good compression rates and reasonable quality video
If you really want better quality at lower file size - export your video from Camtasia at "Full frames (uncompressed)" which will give you a largish file size video with good quality, then use Auto Gordian Knot to compress it. The reason this is better than using the Xvid or DivX compression within Camtasia is that Camtasia is not a compression program and won't necessarily give you the best results. Auto Gordian Knot is a specialist compression program.