Some great suggestions here. If you like the smoky/peaty greatness of an Islay malt, you can't go wrong with Lagavulin or Laphroaig. If you want something sweeter and a bit fruitier, then you'll probably like anything from Aberlour (especially A'Bunadh). If you want it really smooth, Dalwhinnie will do the trick. And for overall balance, Highland Park.

Really, any of the ones mentioned here will be fantastic. As would some of the others that tend to get a bit less attention such as Jura, Caol Ila.

This is an excellent justification to spend some time at a whisky bar doing some sampling.