Sounds like you got a pretty tight set-up, bro!
A little paranoia can be a good thing. But you never really know sometimes...get someone to nmap your
box, top to bottom, and see what they (or you, for that matter) find.

Even so, anyone lucky enough to piggyback it is gonna have a tough time of it if you have a decent set of
keys. Between the VPN and any other encryption protocols that you're using for the connection, they'll have
to have some outrageous horsepower to unlock anything they do snatch.

If you do get a good probe job done, let us know what happens.

Cheers,

zaddikim