I'd agree that meals are definitely going to be a big part of your budget with a large family. You don't mention the ages of your children. If they are very young (need daily naps or else!) or very independent older teens and you plan to split up sometimes, staying onsite would be nice and the All Stars may be most economical.
However, if you have alot of picky eaters or big eaters, staying at a suite hotel, timeshare-type villa or rental condo offsite may make a big difference in your food budget. So selecting onsite vs. offsite may have to be part of your earliest planning. We've done both and prefer offsite to save a LOT of money with a large group (3 young teens, plus guests).
To stay offsite, a car is essential. Don't rely on offsite hotel shuttles - they're too infrequent, take too much valuable time to stop at other hotels and may require you to leave the parks before the fireworks are finished.
All this said, a nice sleeps-6 offsite villa at a nice place may be found for close to $100/nt - including a kitchen for big breakfasts, planned snacks, frozen soft drinks & late evening desserts. By throwing together convenience foods from the grocer or eating at offsite chain, buffet & family restaurants for some meals, you'll save much more. Offsite restaurant prices are likely to be very similar to whatever you find at similar places back home. By comparison, the onsite food courts will seem overpriced for their convenience (unless you live in a very expensive city at home anyway). Some offsite suite hotels also offer free, hot breakfasts (good for hungry teens) and "kids eat free with paying adults" deals.
If you get a 2BR villa, it will probably have 2 full bathrooms: Important for most large families. If offsite, be sure to get a place within 5 miles or so of Disney property, putting you about 10-15 minutes from door to gate, of the nearest Disney theme park. Feel free to write me with any questions about offsite timeshare villas (we own some elsewhere and have visited several in the area).
Look for more info on offsite budgeting and planning at the forum called "
Orlando Hotels and Attractions."
If you want to stay onsite and/or you won't have a car, two rooms at the All Stars or a sleeps-6 Fort Wilderness Cabin will be the cheapest deals... with discount. Having stayed in them both, we would not return to either since neither offers the kind of Disney themes we like (for the price), no pool slide, no hot tubs, limited space for our group. All Stars has tiny rooms and no kitchen. FtW Cabin has complex transportation that takes too long and is less reliable than most. And lastly, they no longer offer Early Entry for onsite guests. But these things are very individual and you may love them - many do.
Another onsite option, if your trip does not include many Fri or Sat nights, is to rent DVC points from a DVC owner and stay at one of their resorts in an onsite 2BR villa. These are wonderful. But after checking the number of points you'd need to rent (at $9-$11 per point) for your planned stay, it may or may not be economical. The Points Calculator is found in the DVC section of the home page for DIS.
Hope this helps. Keep reading. You're on the right path to budgeting well for your trip. Start with accommodations, add transport (air/land) & gas/parking, then theme park passes (decide which parks you want to see and how many days at each... all Disney or others too?), then estimate food & souvenirs. With 6 people, it's all guaranteed to add up quickly. Orlando is a really fun place to build memories for your family though! Hope this helps!
