Quick, distant subjects-What camera to use???

I am looking to buy a new camera/housing and am in need of a smaller camera with quick shooting capabilities for fast moving, distant fish. What would be your recommendation??? I have done my share of reading and am looking for personal input on a users favorite rig.

Thank you.

The Nikon AF-105-Vr excells at this. I have successfully chased quick moving fish from 3-5'. I tried a Sigma 150 but it is slow focus. I would pick a cropped sensor Nikon dSLR camera. This approach is not small but you consider smaller choices against the performance of this rig.

What do you mean with distant? like 2 meters or more like 10 meters? because that would be a whole new story..