I have yet to see the LBS stock Langsters in these parts- "they" say they can never get them in... so I've never actually seen one. I have heard they have an aluminum rear drop out, which might be a concern.

Frankly, if you are going to park your bike outdoors, I'd opt for a conversion. You won't worry about it at all... whether it be theft or getting nicked up. You could probably build a very nice conversion for about $200- if not half that (if you have a seat, pedals, etc. to recycle).