Please allow me to pitch some alternatives. I know your trip is a long ways off, but based on the amount of savings you have to date I'd like to recommend some alternatives to the $250+/night Disney deluxe hotels.
I'm a young professional who has had to be cost conscious when visiting Disney, which has often meant making concessions in the hotel department. Avoiding "throwing away" tons of cash on a place to sleep could make it possible for you to get a LOT more out of your vacation without feeling like you've missed a thing!
First, a quick opinion of the deluxe hotels. While the theming can be very impressive and exciting to be around, all disney hotels have fairly impressive theming and the inflated "deluxe" prices can leave lots to be desired, especially if you're on a tight budget. At the end of the day, deluxe rooms, theming aside, are no better than your average Marriott or Hilton hotel room.
I don't know you or your standard of living, but most people visiting Disney, especially for the first time, should basically be blown away by most of the moderate hotels. They are just as nice and the difference in the rooms is negligible. You might get a few more square feet (literally, a few) or a bigger bed in a deluxe, if you're lucky (I had to fight for my king size bed on my last trip to AKL) but all in all, the moderates are just as cool as deluxes and the difference in actual quality is not reflected in the price.
I guess some updated deluxe rooms at CR, GF and maybe Poly (I don't know)have flat screen TVs and fresher furniture. But, don't forget that "view" rooms are more expensive than "basic" rooms at deluxe hotels. I don't agree with these things being worth $100-1000 more per night. For my money, I'm happy with saving that money and being able to enjoy better meals, snacks, drinks...and don't forget your first time souveniers! Everything from a professional picture on Main Street USA to Minnie ears to t-shirts/sweatshirts to light-up necklaces adds up quickly and it's nice to not have to go into debt to be able to afford that stuff.
Since you've never been there, even staying off property would be exciting for you. Just being in the vicinity of Disney is electric. You can start by looking at the hotels on Hotel Plaza Blvd (Hilton, The Palace, Best Western, Double Tree, etc.). I believe these hotels are on property, but even if they're technically not, they are within the "gate" on the east side of the property and just steps from Downtown Disney. The Palace is a nice hotel, with rooms larger and nicer than most moderate Disney rooms at about the same price. They even have rooms that face the parks for fireworks viewing, etc.
Another good close-to-property option is the Marriott Village on Vineland Ave just SE of the property on the other side of I-4. These are relatively new Marriott hotels (Courtyard, Fairfield, etc.) that have good prices and lots of local restaurant options (Uno, Bahama Breeze...Hooters

). You always have the option of exhausting your day at the parks and then crashing at these cheaper hotels. Oh, and breakfast tends to be included - that could save you $30-75/day.
One word about value resorts. I've never stayed at one of these, but they appear to be like a Motel 6 with big, larger than life theming surrounding the buildings. If that standard for a room doesn't bother you and money is a issue, but you REALLY want to stay on property, go ahead and consider one of these. They're just not for me.
All in all, it comes down to what you can afford (or how much debt you're willing to go into) and how you're going to be using the room. If you're going to be out all day and using the room for a crash pad, paying for a deluxe could be not worth it. If you plan on spending time at the hotel's ammenities and spending time taking breaks or naps in your room, then you might want to look at it. Either way, a moderate is MORE than enough for MOST people.
Good luck on your search, LONG

wait, and have fun!!!