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I'll second that; while my commuter isn't exactly a "beater" bike, it's not nice enough to really draw attention, while the road bike I'm getting in next Friday-or-so sure is.
What kind of lock did you have?
I'm assuming you're talking about the 700x23C tubes that most road bikes use? They tend to be reasonably resilient, and can always be patched in case of flats. I'd be more worried about damage to a set of lightweight rims, but I'm not too familliar with the type of road you mentioned, so I'll leave that one to more experienced members...