And the same is true for the 1080, more or less.
The 1080 Ti won't last long enough to make up for the price difference, especially since better GPUs are coming out for less money all the time.
I usually go for the mid range option (currently on a 970) and upgrade when I feel it's necessary. Has worked out well for me so far. Of course it depends on his needs. If he plays a lot of AAA games and wants the best graphics possible all the time a 1080 Ti might make more sense. But for 1080p it's honestly overkill IMO.