Does your hubby really want to go back in 2006? If so, then it doesn't seem like he'll need much prodding! I would definitely stay at any of the resorts in the Epcot area; our favorite is the Boardwalk! Sometimes the Swan/Dolphin have better deals than the other Epcot resorts, so that may be something to suggest too. Does he like to fish or golf? Maybe that's something you can schedule into your trip.
If he really doesn't want to go back, I feel for you. My DH is a bit tired of WDW (we've been around 15 times) and he actually didn't go with us in April 2004 and isn't coming with me, my mom and DS in 12 days! We've gone on different vacations like Aruba, Key West, Bermuda for just sun and relaxation and I have to admit, they were great trips. He did say thought that he'd be ready for a WDW trip in a year or 2.
Nothing I could say could convince my DH to go back to WDW right now.