This may change as I test prototypes. Keep in touch. A separate accelerometer may be required also. This depends on how well we can read acceleration with the fluid sensors. A pair of low light color CCD cameras should do quite nicely, thank you.
Night vision is useful for the security robot application.
It may be useful to include infrared cameras. While this is a non-human sense it is too useful to pass up. A pair of the good electrohet mikes should hear better then I can. This will also need an amplifier and a digitizer. There is some work on using spectral analysis based on the external ears filtering properties.