There are only 5 ingredients in this salad, so make sure they are of the best quality you can get. Spring for the good cheese, don't buy the stuff that is already crumbled. It tastes like Styrofoam. Make sure the nectarine is ripe & luscious, under ripe fruit doesn't have any flavor.
Normally when I make this salad, I add in crispy prosciutto. Place a few paper-thin slices of prosciutto on a non-stick (Silpat) silicone baking sheet if you have one or parchment paper if you don't, put this on a rimmed baking (cookie) sheet and bake at 350 degrees until super crispy.
Fresh mozzarella works beautifully in this salad if you don't like blue cheese. As with the blue cheese, get the good stuff, not the shredded cheese in a bag that you would throw on a pizza.