We also have a DD11 who is Asperger's/HFA. We have not stayed at a mod with her (have on our own, though). We have stayed at value and deluxe with her (AS Movies, Pop, AKL, and BC). If you can afford it, I'd pick BC! We recently got back from there and LOVED it! There are movies on the beach every night; a great pool area (Stormalong Bay, that has a great slide, a "whirlpool," a lazy river area, and beaches to play on); lots of kids activities, both inside and outside; Beaches and Cream (restaurant), as well as other restaurants; and best of all, a great location! We were just a few minutes walking distance from Epcot. You're also only a short walk to the Boardwalk area and about a 15-20 minute walk to DHS (or you can take a boat!). The fact that we could just walk to some of the places was a big plus, so we didn't have to wait in lines for buses or monorails to get everywhere (waiting in lines can really stress her out, as well as everyone else around her!). From Epcot, we were able to take the monorail to MK (see if you can ride in the front seat--no other people besides the pilot, you get a "pilot's license" and it's really cool!). The only time we HAD to take a bus was to get to AK, but it was a short bus ride. We did take the bus to MK once, too, and it, too, was a short ride. You will have to stop at a few other resorts on the way back, but they're all really close together. If you need to, you can get off the bus and walk the rest of the way back to BC, a nice relaxing way to finish off the evening, if DS isn't too tired.
I like the fact that at the deluxe resorts, your room opens to a hallway inside, rather than opening to outside, a big plus when you have a child who tends to wander or escape from the room. It just seems a little safer.
Important things you'll need for your son: earplugs (Disney can get loud and overwhelming--these make a big difference), a GAC (Guest Assistance Card...get it from Guest Services--it also makes a big difference...check the DISabilities board if you're not sure what this is...there's a sticky about it somewhere, I think), a stroller (Disney's a big place involving lots of walking. It is too much for my DD11, and my "typically functioning" DD7), flexibility, and a sense of humor. You may want to get him into either collecting autographs or pin trading, both of which can be great learning experiences for our kids.
Hope this helps! Sorry it's so long.
