I have always wanted to get my hands on a titanium mug. They are so versatile. As well as an aluminum bottle or equivalent. Just haven't found what I want for the right price.
Don't worry - they will never (well, hardly ever) be available for the right price. Just bite the bullet and get one - you will be glad you did. That has always been my experience when purchasing something that seemed very pricy but that also offered real advanages. Way deep in the woods, the initial cost can seem rather trivial when your gear is keeping you snug and warm.