Vista Way is basically right across the street from the Holiday Inn Sunspree.
It's also walking distance (granted, a long walk, and I don't remember if there are sidewalks for the whole way or not) from the DTD hotels, and a much shorter walk (again not sure if there are sidewalks) to the Vistana Resort (timeshare)
None of the on-site resorts would be within walking distance from Vista. I think, as the crow flies, the closest resort would probably be Pop Century, but with the way the roads are laid out, the closest one in terms of driving time might be Caribbean Beach or Saratoga Springs.
One thing you might consider is get a group of 3 or 4 ppl from this board together and go in on a hotel room together ... makes things much more affordable that night.