Pizza: definitely Dieci!
Their secret: they have an electric hotbox in the back of their Fiats, so your pizza arrives pipin' hot
Other food: definitely Royal Gourmet, although it's only a delivery service.
Best chili con carne (hot!) comes from "Carribean" on Langstrasse, 21.50-
Best kingsize (1 foot!) cordon bleu with lousy fries comes from "Bierhalle", 27.50-
Best Indian curry: Madras Lamb curry, comes from "Taste of Paradise" (it's in Migros City, Löwenstrasse), 24.50- IIRC
They also deliver from Hiltl (yummy vegetarian), Chopstick (wellspiced Chinese/Thai), Mr Wong (blech), Mexicano (expensive, chili con carne 31.50

) and a host of other restaurants.
Minimum order price: 40 franks, if you're ordering from several restaurants at once, there's a surcharge of 1.50- per additional restaurant.