I fell in love with Auchentoshan when I visited the distillery just outside Glasgow - here's a link to their website -
http://www.scotlandwhisky.com/distilleries/low lands/218698
I doubt if you'd be able to get hold of this particular one anywhere other than in Glasgow (but don't hold me to that, I've just not seen it in the shops down here).
Do you know what sort of scotch your friend actually likes - they vary greatly in taste, smoothness and aroma - and it would be nice to get one s/he would probably like !
If you can't decide, then I would recommend one of these fine single malts (ok they are available but not cheaply):-
Highland Park
The Balvenie
Talisker
Jura
Tobermory
Oban
Dalwhinnie
Glenmorangie