Ashton VSG are generally considered a good stick for aging. I also have a box of sun grown 858 that I'm trying to hold onto for a year. Someone above mentioned Opus X, which I have no doubt taste phenomenal after 5 years, but they also taste phenomenal ROTT to me at least, so I end up just smoking them
. Everyone's pallet is different though and mine is not what I would call refined so your mileage may vary. I just try to find the things I like in the humidor and not worry about their age too much. I'm finding the opposite is true for the cc's though. The longer some of them sit the better they seem to get.