Cayenne - Red: Classic Cayenne peppers with some heat.
Hatch Chiles: Big peppers with a big flavor, and my personal favorite - good fresh and even better roasted! This variety is mild-hot, but it depends on the particular pepper sometimes.
Italian Frying: A great shishito alternative - long, tasty peppers that are great for frying. I like to use a dipping sauce for these (or shishitos): Sour cream, large pinch of fresh dill, squeeze of lime juice and a pinch of salt.
Bells: Classic sweet bell peppers, great for fresh eating, stuffing, roasting, etc.