This is really down to your personal taste, as so many mushroom varieties will lead to a delicious mushroom pasta dish. Common varieties like cremini, button, and portobello (which are actually the same type of mushroom just at different ages) are great. You could also use shiitake, morel, porcini, oyster, and chantarelle. Several supermarkets sell 'wild mushroom' variety packs which would work too.