Never had Dufftown so I can't comment but all the others mentioned are right up there at the top of the tree. Highland Park is a fine choice for a mellow evening.
As we all seem to share a similar taste, might I recommend something a little off the beaten track? Do try out Connemara, a pot-stilled West Irish malt that more than holds its own in such august company. Its a bit tricky to track down but well worth it.