Although I don't own any, I think titanium might be the best all-around material for bicycle frames. Assuming it's properly put together in the first place, it will likely outlast all other materials. It doesn't have paint to chip or scratch (and doesn't need any to begin with) and it's more resistant to dents from drops and crashes than other materials. It also has very good ride qualities.

Now, is it twenty-two times better than other frames? Of course not. But if you want to buy one more frame in your lifetime, titanium is a good way to go.