Two that I know that work for me is McDonald's Cheeseburger Meal, usually with an extra burger, and KFC's Bacon & Cheese Fillet Burger Meal. But I try fairly hard to leave at least a week between visits to either. My preferred "fast" food is a sandwich or a sausage roll. I don't like Burger King (which is called Hungry Jacks down unda).
Actually, it's pizza that usually does me in. Some Pizza Hut pizzas are way too greasy and this doesn't work for me. I almost always prefer the McCain frozen pizzas from the supermarket.
Yes, McDonald's do a decent cup of coffee. Even in those places where there's a McCafe, which I usually avoid.
Wade.