I haven't had a decent bottle of single malt in the house for ages. When I do it's usually Glenmorangie, as it's the only whiskey the missus can stand.
I love a good Islay although Laphroaig is not my favourite. Bunnahabhain, Caol Ila, and Bruichladdich are definitely worth a sniff.
A pub favourite is Highland park, preferably 18 years old, also Jura and Talisker.
Penderyn, the Welsh one is also a good tipple, Yamazaki is a good Japanese single malt, and Glenfarclas is a stunning drink, but not easily found.