I would play around with booking online on Disney's website to get an idea of the cost. You can get the prices for park passes, too. I think you can even do flights but I would research that seperately. We usually fly Southwest from NY (LI). Jet blue usually has the lowest fares (that I have seen).
Disney's website is a PITA and very slow but it will allow you to compare the different hotel prices easily. I usually stay at DVC but if I were booking I'd do it right through Disney. I'm not sure if they have the best prices though.
Have fun!
Donna
Mom to JT 1/03 and TJ 8/04