You will love Universal & IOA, we found them both to be far superior to Magic Kingdom.
At Universal, Tornado was our absolute favourite experience (not a ride). We also really liked Men in Black, Back to the Future, and the kids liked Jaws and ET.
As a family (kids 7 & 9) we LOVED IOA. The Spiderman ride and the Hulk rollercoaster are incredible, and the Dueling Dragons rollercoaster is great. The Island of the Lost Continent is amazing in the attention to detail, the kids really enjoyed the Flying Unicorn (kids coaster). The Jurasic Park water ride was terrific.
Have a great time, and check out the US/IOA discussion at the bottom of this board!