It seems like you are on the right track. Chips & dip and all of the other items sound good. Another recommendation I have is popcorn. It is super cheap and everyone loves it. As for substance/filling, I think that quesadillas are another good cheap option. You can get tortillas and cheese, and even get some chicken (canned shredded chicken you find cheap by the tuna works great) and can add that into it. That would make a filling snack! Mozzarella sticks are filling too. I also sometimes get vegetable trays, or if you want to go cheaper make your own assortment of vegetables (carrots, celery, broccoli) that you can have them dip in ranch. That will fill people up. Beer is also another item that helps fill people up. Have a great time!