My instinct would have told me to use an Anejo Tequila in an old fashioned. Then again, I have never tried one. Is there a reason to stick to Reposado?
After reading your comment, I consulted my local liquor control commission web site only to discover that Anejo Tequila is exponentially more expensive than blanco, reposado and silver. As I would dearly like to keep this husband, I won't go over $100 a bottle (and those are Canadian dollars!). Is it even worth the effort to try it with a brand that is less than $100 per 750 ml bottle?