changing your timing belt before 60k is a waste of money....I have owned 8 cars, all different manufacturers, and I have never replaced a timing belt before 100k...never had a problem with any of them....if the maufacturer reccomends replacing it at 102k, then it should last to 120k.....they always tell you to replace it early, and if the belts consitantly died before 102k miles, then they would reccomend replacing it earlier......its just like people replacing their synthetic oil at 3k miles....its a waste....
although if it makes you sleep better at night, do whatever makes you happy(headbang)