As beattyfamily said, it really depends on the kind of vacation you want/can afford.
We are a family of 3, 2 adults and 1 child (who at 10, is now an "adult" for park pass purposes). Our trips usually cost around $3500 for airfare, park passes, food, towncar transfers to/from airport, resort, and the extras. About $700 of that is usually airfare for us. We usually stay at a deluxe resort, and have had good luck in the past with getting resort-only codes (which seem to becoming more rare in the past year). In May we were able to snag a standard view room at AKL (we were upgraded to pool view at check in) for $129/night. We have stayed at WL on a similar rate, and at the Swan with the government rate. We will be staying at BCV, in a studio, in Jan for under $1000 for the week (we are renting points at $9/point, from a DVC member).
I, like many who frequent these boards, do like to get the most for my money, so I am always looking for discounts. Even a $5 discount coupon on a towncar transfer can help (note: a towncar transfer, with tip, can be close to the price of a shuttle, and is more convenient)! We never rent a car if we are just doing WDW, but if you feel you need one there are usually discounts to be found (check out the transportation board).
We tend to eat a lot of breakfasts in our room; we take advantage of the free grocery stops that many towncar services offer, and stock up on juice boxes, granola bars, bagels, etc. We pack snacks in our fanny packs. We find this helps with our food budget. We generally do one sit-down dinner, and one counter service dinner per day. You can view restaurant menus and prices at
www.wdwig.com and that can help you plan your food budget.
If we were smart, we would have bought AP's for our last trip, as here we are heading back within the same year and plunking money down on hoppers all over again (kicking myself at this very moment!). There are discount ticket brokers, such as paramount, ticketmania, and hotwire savings club, and they can save you some on tickets. You'll have to decide what kind of ticket is best for your trip, and that will depend on how much time you will actually be spending in the parks. The more days you are there, well, the more it will cost!
We aren't souvenier people, but if you are, plan accordingly, because all of those disney trinkets can burn a hole in your wallet quicker than you can say "pixie dust".
My best suggestion is to read as much as you can on these boards...the budget board, restaurant board, resort board and transportation board will all provide you with a wealth of information.
www.mousesavers.com is also a great planning resource.
Happy planning!
