Hi, tnk. I've been reading your report on and off for a while and just noticed that you are in Kansas. Me too! Where in Kansas are you? (I'm in Overland Park). Anyway, do you have Southwest's DING! if not, you can download it from their site. It offers fantastic fares for up to 3 months out. When we went to WDW last December, I ended up paying $39 each way!
Also, have you considered "pricelining" your van? We did that one year and while I don't remember the exact price, it was well below any rate we found elsewhere; and the good thing is, you put in a bid and if it's not accepted, no loss to you.
Obviously, you can't count on these things until closer in, but maybe as it gets closer you can save on the budget you already have.
Also, we stayed at
Wespgate Town Center, Which was the #1 best value in The UG
and had 4 stars. It is a beautiful property. We paid $99/night for a studio which has 1 queen bed and a sleeper sofa. They have up to 3 bedrooms and several pools. If you drive the back way (past the "racetrack") it takes literally 10 minutes to get to TTC. I looked it up for a friend of mine a while ago and the rates were $79/night during the off season.
Anyway, I'm enjoying your report, it sounds like you will have a fab time!