Hello, Kristina! I'm so glad you're back with more questions!
Yes, if you book a Walt Disney World Magic Your Way Vacation Package which includes your park tickets, and you have a seven day ticket (without the Park Hopper Option) that means that you can go to any one of the four main parks for seven days.
Regarding pricing, if you put together a package online, then it should have prompted you to enter your children's ages. The price you received should reflect that. However, if your had selected those other options we "chatted about"
in your earlier question, then removing those options will bring the cost down a bit.
While I'm not sure of your dates and resort preferences, I did a search on Walt Disney World's online booking site and found that a one-week July, 2012, stay in a "Preferred Room" at Disney's All-Star Music Resort, including the 7-Day Magic Your Way Base Ticket (per person) and the Dining Plan, would cost $2,579.45 at the time of this writing. Of course, I didn't know the exact ages of your children, so I entered that one is four and one is two. The two-year old would not be included on the Dining Plan, since the minimum age for this is three; however, these children are welcome to eat from their parents' plates or you may order and pay for their meals separately.
If, however, you are seeing the price you mention elsewhere, I'd call to be sure that your children's ages are entered appropriately. Because you want to add the Dining Plan (great choice!), your cost will be different if one of your little ones is under three.
Please look this over and send me more questions as they arise! We can do this! Your WDW dream vacation is just around the corner!