I have a son who is involved in his high school choral and theater groups. Any photos that can be taken will be in a darkened theater with no flash. I would also like to be able to zoom in quite close for head shots. In addition to that requirement, I'd also like the camera to be a good "all around" camera and have some HD video capability, as well as being relatively easy to use. My budget is about $400. I'm looking at Panasonic DMC-LX3 (10x zoom), Kodak Z980 (24x zoom) and Canon Powershot SX20 (20x zoom). Any suggestions? How much zoom do I REALLY need to get those shots referred to above? Thx.