yeah thats an important question..... anyway if u r looking for digital cameras try sony cybershot...I am a satisified customer..it can take picts while moving with good clarity by adjusting the exposure time
I have an olympus one but I will recomend a digital camera that can be triggered externally, via a contact. This is usefull if you want to control the shots from your transmitter. You can use one of the control buttons (spare channel) to remotely activate your camera.
The trick is to find one that interfaces to an external trigger switch.
You can use a colour analogue camera (very lightweight and very cheap) and transmit the TV signal to the ground and make the recording on the earth.
Of course if you want a hi-quality photos this is useless.