I have strong feelings about this, but I had a harder time picking #3 (Boma)
Tiffins and Jiko are far and away the best in the area, and this is on a list of strong contenders!
I gape at Joe Rohde's sketchbooks while waiting for our table at Tiffins, and the food has never disappointed. The whole fish distresses everyone else at our table but it is SO good. (I miss the purple rice it used to come with).
Jiko - can't say anything bad about it. A spectacular meal in a gorgeous setting; the bread (again!) is amazing.
Boma - is very good, but there's enough overlap with Tusker House that I can get my fix in the parks. (AKL/AKV isn't a home resort so we don't stay there so often.)
Restaurants to add:
Tusker House