Johnny Walker Black Label sure as hell doesn't have a "nasty" taste! I usually drink Red Label though, as the Black is a little out of my price range. Only difference is how long it's aged, but you can sure as hell tell the difference. I think Red Label is 10 years and Black is 12. They also make a Blue label, though I've never had the pleasure. It's aged 100 years and goes for around $160/fifth.
ETA: ( every movie I have ever seen where they drink "Scotch on the rocks", is either Red or Black label. The square bottle is a dead giveaway. Bond, James Bond, is 'probly the most popular character. 'Probly why I drink it, heh, heh! )