wow, cali and medellin are pretty dam high. havent been to cali in years but i know medellin can be a bad place sometimes. Mostly its local crime, robberies, muggings/ foreigners and partiers being drugged and then robbed. but you get the real big ones, like the narco hit in the disco a while back where 5 or 7 by-standards were killed.
you might want to try Piereria or Armenia if you want to stick with colombia. i myself want to take a trip to the Dominican republic, or Ecuador later this year.