Macallan 18 was from 1983.
I had Bowmore 17 at the Dufftown whisky festival (where Fiona keeps it in stock at www.dufftown.co.uk)
and it was excellent and beat the 12 year old hands down. I think the 12 year is sherried and tries to be all things to all men too much.
As for Balvenie, try and get the 3 miniatures gift pack which consists of 10, 12 and 15 year old. The 10 yr is available in most supermarkets for under £25 and that's the one I would make a bee-line for.
Glenturret, if you have the cash, takes of with age. 12 Yr is excellent, 15 is better 9apparently) and 18yr is nectar from the gods.
Norwegian connoisseur Per Lovlie assures me that Talisker is rotten at 8 and 12 yr old but brilliant at 10 (I agree with the 10 yr but have never had the 8 or 12)