My two favourites are Laphroaig Quarter Cask and Talisker 18 year.
the 10-year Laphroaig is a bit rough, so don't judge all Islay whiskys on that one!
If you want to gently adapt your palate to the peaty smoky taste, Ardbeg is a very mild Islay. Put a drop or two of water in to totally change...