no one has a single rec?
Well then I guess i'll give you what i've found so far and see what you think of each one.
CMUcamIII- all the great image processing of CMUcam2 *ie. histogram, differencing, etc.* mixed with the ability to load your own algorithm on the processor. Tons of previous usage by other teams, wide amounts of support. inter changeable lens. ARM7 processor
Blackfin SR-1 - CMUcam on crack, just like give it a 500mhz processor and the ability to go stereo scopic and you have the blackfin. Also has properties of being a control board instead of just being a camera.
NXTcam- great for using with lego mindstorms NXT, might have to do some hacking to get to operate with anything, on board processor, line tracking, 8 color object tracking.
POB - CMUcamIII with the ability to recognize patterns out of the box.