Into the Electric Castle is on the same level, with no songs I'd skip and an equally impressive and well-chosen cast list.
At the same time, The Final Experiment is a fantastic album with some beautiful orchestration and fantastic vocal performances.
Universal Migrator, Part 2: Flight of the Migrator is a metal album of incredible energy and passion, with another all-star cast (Bruce Dickinson, anybody?).
Even the Universal Migrator, Part 1: The Dream Sequencer's prog-rock is solid and although it doesn't grab the attention it is clearly not meant to but the songs still seem brilliant every time you listen to them.
I'll admit I don't much experience of Actual Fantasy but by all accounts it isn't the greatest of his works…