If you shoot sports, then you know how valuable a long lens is. All the cameras you mentioned are camcorders that do not have good telephoto lenses.
I shoot with the HPX-500. There is no other full-size camera that can give you all the options you need to shoot with. The HPX-170 does give you all the options. There is a trade off with a shorter non-removable lens.
Get a camera that has all the options you need to cover the events effectively.
Steve Eisen
Eisen Video Productions
Board of Directors
Chicago Final Cut Pro Users Group