Maybe get a beater resto-project as well.

Worked well for me in rough areas so far.

Also, go ahead and scrape the logos off your Surly if you're worried about theft. The head-badge too. You could get a hand made head-badge to replace it.

And always, carry a big lock. Something with a small-shackle as long-shackle gives more pry-bar room for thieves. I lock all my bikes (beater or not) with two locks. Yup. Over cautious, much? Maybe.