Which is why I suggested the Canon SX200IS. It has Av, Tv, M, and P modes. Plus it has a 720p movie mode and a 12x (wide-end) zoom. If the manual modes are important, then the SX200IS is the one to get. However, the ZS3 (and TZ5) have better movie modes in that you can use optical zoom while recording.
But then the ZS3 doesn't have the manual modes as you mentioned.