If the ziti is hot, cosider the mostaciolli and sausage recipe on the lotsa pasta page, fine for 125. If a side dish, you can omit the sausage. I would not serve pasta salad, ziti and potatoes at the same meal. With the corn also a starchy vegetable, I would serve a non-starchy vegetable blend, broccoli, green beans or such instead of one of them, or else marinated cold veggies antipasto style with artichoke hearts, grape tomatoes, pitted black olives, etc.