Though there are some really great options (and some not so great), I'd opt for Punisher. It's what he does. Aside from the "usual" protection, how cool would it be to replace the "Neighborhood Watch" signs with the "Punisher" symbol. Man, anyone dumb enough to smurf around in that neighborhood would just be asking for it. In the event that the Punisher gets out of line, like smurfing up my lawn, or some dumb trout, I feel, since he doesn't have any real "Super Powers", that I wouldn't have any problem giving him "the boot", or "the fist" (if need be).
If I were to choose a Punisher replacement, it'd have to be Superman.