Have you thought about bidding for a room on Priceline. I have done this a few times. Check out a site called biddingfortravel.com (scroll down first page til you see Hotels, Florida, Orlando/WDW and click on it). It is really great. I have personally won the DTD Hilton and Wyndham hotels and had very nice rooms/stays there. They frequently sell rooms through Priceline in the WDW vicinity area as a resort hotel for $60 to $70 a night. You actually have two bus option choices here. There is a hotel bus that takes you the park (this is shared between the DTD hotels) and you may have a few other stops at those hotels before delivering you to a park. The other option is very easy, just walk across the street to DTD and catch Disney's bus. Neither of these walks were very long from Wyndham or Hilton. I have not had a problem with Priceline either and will continue to use them in the future. Be advised though, that once you purchase the room from Priceline, the sale is final no matter what. No refunds, exchanges, whatsoever.
Other than that, you may want to checkout prices at Pop Century for the time your going. It is Disney's newest value resort and of course you will get to use Disney's transportation system. Also staying on Disney property gives you free parking all over the property just in case you decide to drive to the parks instead of busing. Just one more option to consider.