In just about all cases you will do better pricing things out yourself.
You didn't say which part of VA you are in. SouthWest airlines is offering fares, out of BWI, as low as $75, incl tax, per person, each way. A price like that, on Southwest or another airline, would put your travel costs at about $450.00
Since it is your first time there, I'd go for seven days. Four days has never been enough time to do close to everything. The least expensive time to go, would be late August. Courtyard by Marriott, in the Disney Village Hotel Plaza, is offering a $20.03 or $39.00 rate for that time. I don't know if it is sold out yet. You could also try the All-Stars. Their rate hovers around $70 for that time of year. Both of these choices keep you under $1500.00 for six nights.
If you only planned on doing Disney, both those hotels offer transportation to the parks. If not, I'm guessing a rental car would be about $200, gas included. Others would know better than me. We haven't rented a car in such a long time.
Five day PHP passes, two adult, one child would run about $630, thru Connections, (that is not an exact figure), which are the least expensive I've found, and they include two Pluses so you could go to a water park or Pleasure Island too.
This is a little over $1500, but, since you wouldn't mind renting a car, you could also choose an off-site hotel that was less than $70 per night and get some savings that way to brind the cost closer to $1500 for seven nights.
There are lots of places online to compare and check prices. People here always have given me the best advice too. Your budget is very doable. Have fun planning!
Daisimae
