My most intense ride is actually Wild Mouse at Blackpool. I've never been subjected to such intense G Forces on any other ride in the world, plus I actually came of the ride with bruises and aching joints.
I don't find Stealth "that" intense, I can't feel much difference in the launch compared to Rita until the end of the straight, the airtime at the peak of the top hat came as a complete surprise however.
Furius Baco is another very intense rollercoaster that comes to mind, the launch isn't very strong but the drop after it kicks some nice ejector and the oncoming corner pulls some pretty heavy forces. The inline gives some epic hang time too, love it!