Garmin make excellent ones for outdoor use.
I use a Tom Tom one in the car and it's fantastic, but they don't do an outdoor sports one.
One thing I would recommend if you ever want to use it in the car for roads etc, is to get something where the maps can be uploaded/updated.
Mine has all the UKs speed cameras loaded on it, and you can d/l updates to that, and the maps (when they build new roads etc).
Also it uses bluetoth to hook up with my phone and get local traffic reports - if there's a roadblck it dynamically recalculates e route.
All totally useless features to a walker I now realise, so I'll STFU and sod off.
