whiskeyrookie - hello!
Maybe this will help you...Here are some of the best selling single malt single malt Scotches sold in the States: Glenfiddich, Glenlivet, Macallan and Balvenie. Do you know if your friend prefers a single malt or a blend? If he/she does, here are some of the best selling blends (in the States): Dewar's, Johnnie Walker, J&B, Chivas Regal, and Cutty Sark.
I hear that Glenmorangie is the best selling single malt in Scotland and the The Famous Grouse is the best selling blend in Scotland.
There are so many good whiskies - if the above doesn't help you, then try and find out what Scotch your friend drinks now and maybe that will help me help you.
And by the way - have you checked out all the different Scotches on this site? Take some time to read about them which may help you with your decision.
Personally for me, I like Glenlivet 18 Year Old and Glenfiddich 12 Year Old.