SmoothWall's Corporate Guardian 3 is one of the best value firewalls on the market. Just provide your own base PC, and the installation will take care of everything else.
The tough Notebook Guardian certainly appears sturdy on initial visual contact - from lock to cable. It is made of steel with a strong looking keyed lock function, although PC Guardian does manufacture other locking choices such as the combination version illustrated. The cable is black vinyl coated and blends into the surroundings. We are still waiting for a manufacturer to use Day-Glo colors, which would certainly say "hands off."