Disney World is a blast. Magic Kingdom will be extremely crowded.
I would have suggested that you stayed at DW because they do cater more to their guest that stay on the grounds. I would have also suggested October is about the best time to go. Magic Kingdom has "Not so scary fright nights" in October. They close MK at 5pm and re-open at 6pm only to the special ticket holders, which is only about 5,000 tix per night. No lines, no waiting, no crowds.
Have fun!
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Bobby
Died 5/1/08, resurrected 5/15/08
ASCD SD hood, 17" Bullitts, Overkill PCM, 3.4" Pulley, NGK TR55IX, K&N 9" cone filter, JimmyC D/P, U-bend removed, Flowmaster 40 series, Hooker big bore tips with resonators, S/B brake lines, drilled/slot rotors, GMPP handling kit, KYB struts, F&R strut supports, HID's, LED's, 2.5" Air Dam, red GTP overlays on custom badges, white rear insert.