M.F.
We just went last month. It was me and 4 kids, we had a blast. We too spared no expense. We also spent around $5000. We stayed at the Nick Hotel and used thier free transportation to go to parks. We went to Universal and Disney. If I had it to do over again we would have stayed at Disney. I think we would have saved money and enjoyed the convenience of staying there. There was no way we could have seen it all in one day, I think staying there for 5 days and seeing every park and spending at least one day laying by the pool would have been perfect. I purchased the airline tickets and paid for the hotel in advance and then counted on having $1000 per day for food and entertainment. I didn't spend quite that much but it was nice to come home with money in the bank! I know you can purchase park tickets in advance for a discount. I think right now disney has a $1600 for a week package. No matter what you and your kids will enjoy it! Disney was so much more fun as an adult than it ever was when I was a kid!
If you have any questions send me a message!