Low latency ...

You want/need a camera that responds fast. Start with Canon and Nikon (I prefer Nikon but both are good). The big SLRs are the fastest in general but some of the compact cameras are pretty good. Go into a camera store (not a big box retailer that also carries washing machines) and do a hands on compare. Press the shutter button and see how quickly the camera responds. If the lag is very noticeable, it is probably longer than you want. Pre-focusing helps -- on most cameras you can partially press the shutter button and get it to focus and set the exposure. Then when the picture is exactly what you want, press the shutter the rest of the way for a much faster response. I have a Nikon SLR and a Nikon point-and-shoot. While the latency is noticeable in the smaller camera, it is still quite fast -- I seldom have to pre-focus to get what I want.