Which Glenfarclas should I get?

I just got back from a trip to Scotland where I discovered Glenfarclas for the first time. Although I generally go for smokier malts, I fell in love with all the drams I tried (the 15, 25, and 30 year old), and would love to pick up a bottle now that I'm back. The problem is that none of the liquor stores in my area (Boulder, CO) seem to stock the 15 year old, and the 21+ ages are out of my price range. What would you suggest picking up, the 12 year old ($60) or the 17 year old ($110)?

Thanks for the help!