Espresso is a very personal experience, and everyone's taste is going to vary. No ones taste is "wrong". Of that pack you linked to, the Malabar Gold is my favorite. Illy is very popular because it's very drinkable - but I feel it lacks some complexity that you can find with other coffees. I tend to order Cafe D'Arte, Klatch Coffee and Atomic Cafe. Another wildly popular coffee is the Lavazza Super Crema. It is also very easy to drink, and is versatile either as Espresso, long coffee, or in a milk based drink.