Any version of truffle works for this recipe. You can add truffle powder or oil to the yolk mixture, truffle salt on top, or even finish with shaved truffled pieces. Just taste until it's the right level of truffle flavor!
I doubt you'll have many leftover, but these deviled eggs can hang in the fridge in an airtight container for 2 days. Save the prosciutto garnish for right before serving.