There are some pretty special drams out there. For me the 30 and 40 year olds are out of my price range so the real stand outs that I have managed to get my hands on are The Glendronnach 33YO (incredible sherry sweetness) and The Balvenie 21 YO Portwood (actually get the port coming through combined with Balvenie honey).
On an ongong basis there are two star performers under £40 or so. Laphroaig Quater Cask and Glenfiddich 15 YO. Both knock me out every time and for the money they can not be beaten. 2 totally different styles - heavy peat vs friut and spice but both amazing.