Canon XH A1 for portability and really long and kind of wide lens - from 30mm to 600mm
Easy to transport too. Underwater housings available for less than for removable lens cams.
I've shot with it in -20 Celsius for four hours and the internal battery sustained the weather.
I've shot with it from the Christmas 2006 and the HDV short GOP codec has fallen apart for only one time, and I've tried many ways of breaking it up, much much better than Sony HDV long GOP.
Those A1s are available for cheap so don't worry too much.
Else you would desire the XDCAM EX1 fom Sony but it is about three times the price once you've set with all the high capacity recording media and so on.
Cheers,
T