What's better than Jack Daniels?

What would be a good gift for someone who like Jack Daniels whiskey? I'd like to know what the best whiskey's are in this flavor. From research, it seems like Tennessee and Kentucky are very similar and that the single malts are a completely different taste. I've seen JD Single Barrel, but I'm not sure if there's anything better that I should be getting. I'd even be up for putting a nice variety pack together. Thanks for your help!