I don't drink scotch, but my grandfather does. He says he can't tell the difference between the cheapest Johnny Walker label and the most expensive one. I'm assuming Johnny Walker is fine since he's been drinking it forever and price isn't a factor for him. I'm pretty sure he gets Red Label.
Only other scotch I've seen him drink is Dewar's White Label. Not sure how that is though, but I'm assuming it's similar enough to Johnny Walker.