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No lock. If your roommate really wants to steal your laptop all he/she needs is a pair of wire clippers.
 
I highly recommend getting a lock for your laptop. No, its not going to stop your roommate from taking it, or anyone else with the time, but will stop the random guy walking by from taking it. Locks don't prevent theft, they just lengthen the time it takes to steal something and hopefully you'll notice before they finish taking it.

Any name-brand lock will be fine. Kensington, Targus, etc.
 
Not necessarily roommate but suitemates...

Also, specifc reccomendations? Keyed or combo style, etc? Do I need to worry about it damaging the macbook (assuming regular use and not an attempted theft)?
 
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