I definitely want to use digital, not film. Our camera was very high-end when we bought it about five years ago. Now I want a new one, it doesn't meet my needs anymore.
My biggest complaint is reaction time. When I press the button, this camera takes several seconds to respond and actually take the *$@*$! picture. Often whatever I was aiming for is gone or over by then. I really like shooting wildlife and they just aren't going to pose no matter how much I plead.
I also want a camera that will work with lenses for zooming and fancy effects. My current one allows no attachments.
Are any of the models you listed specifically good with reaction time?