My go-to Islay has been Lagavulin for many years. Unfortunately I still remember the days of being able to pick up a bottle for around $75 and it's now closer to $120, so I don't have a bottle going as often as I'd like. Lately I've been sampling the Buichladdich distillery products, which is actually an old name that has recently been re-born. I've only had a chance to try some of their un-peated selections, but I note that they now have a line of heavily-peated choices if that's your thing.