I like Glenmorangie with coke and ice, or Glenfiddoch neat. Glenfiddoch has a more distict, earthy taste to other whiskeys IMO which would be killed by any additives.
I have to say though, that there's no point in being a purist when it comes to whiskey... In Scotland, we drink what we like, how we like, when we like. There's no rigmarole or custom, just people who miss the point of whiskey; which is to get you absolutely hammered in a short space of time. When you pour someone a whiskey, you ask them how they want it and are just glad to have someone to drink it with. With a decent Scotch, you might encourage them to try it neat, but it's no big deal - neat whiskey is a pretty heavy drink, it's probably best that people are willing to soften the blow.
I tend to refer to it as Scotch when it's like 12yo single malt stuff - we have a wide selection of blended, cheaper stuff which does the same job, but I'm not a fan - I'm Scottish but I'd still rather drink rum or brandy than blended whiskey. In fact, I'd rather have a bottle of Remy Martin cognac than any whiskey I've tried.
