probably my laptop simply because of its monetary value.
either that or my cell phone because i would never be able to remember or find the numbers of all my contacts, and theres no way i'd make one of those 'LOST CELL PHONE, NEED NUMBERS!' groups on fb.
i don't really have any items that are REALLY important to me. i mean, i have a few gifts from people and old toys that i would be sad to lose, but honestly i'd rather those them than my 1600 dollar computer. :|
oh, or my camera. it would suck to lose that, too. but again, its because it was so expensive, not because its special to me.