My favorite sandwich is from a salumeria called Faicco's in NYC. Salami, prosciutto, capicola, spicy soppressata, ham, fresh mozz, shredded lettuce, tomato, roasted red peppers, extra virgin olive oil, black pepper and balsamic vinegar. A mouthful to order, but to me, it's the perfect sandwich.
The spiciness of the soppressata, melding with the buttery, paper-thin sliced prosciutto, the saltiness of the salami and capicola, mellowed out against the sweetness of the roasted red peppers and the fruitiness of the high quality olive oil, the creaminess of their AMAZING fresh mozz cut through with the acidity from the good balsamic vinegar all on a freshly baked, crispy-yet-slightly-chewy Italian hero roll... Man, just writing about it makes me want one. Not the cheapest sandwich you can order, but so worth it!