With a commuter, I worry about whether bike bling will cause bike theft. A ti frame would be an awesome ride for commuting, but will it get stolen from outside the grocery store or restaurant on your way home? You might be able to treat yourself to a ti frame with less risk by buying used.
I love my ti frame, it's easy to keep clean and has a great ride quality. But I'm always fearful anytime I have to lock it up outdoors.