I'd say I spend about $100/week on groceries, and we spend about $50-$75/week eating out for the 5 of us - Me, DH, DS13, DD9, and DS7 1/2. We eat in at least 5-6 nights a week, with protein, veggie, and either a salad, extra veggie, and sometimes potato or rice. I pack the kids' lunches every day, and they get a sandwich or salad, veggie, fruit, another veggie or fruit (for the wonderful snack break that every American school child needs to have now), and either another veggie/fruit, yogurt, string cheese, fish crackers, or granola bar or something similar. Breakfast is either whole wheat cinnamon bread, frozen waffles (probably the most "junk" food they eat, and they are almost always the whole wheat version), cereal, or yogurt and toast. My kids are not really very big breakfast people.
On the weekends, we don't usually eat until about 10-11am, and then skip lunch and eat dinner.
Once a week, we will usually order chinese, pizza, or Subway. We are soooo boring LOL Every few weeks or so, we will go out to eat, and that is where we will spend $40-50 at Noodles and Co or somewhere. DH spends about $20/week on lunches, and I spend about $7-10/week on coffee (usually $1 coffee at McD on the way to work!)
Now that we are in football season and it is still really hot in Illinois, our meals tend to be either really irregular (like eggs or cereal for dinner), or we eat out more. All three kids play football/cheerlead, and DH coaches DS13's team. It's a 6/day-week commitment. They don't usually get home until after 8pm.
I budget about $600 total on food costs per month. Depending on how much we end up eating out, I can usually spend a lot less.