The closer to Imagine, which (in my opinion) was his second-to-last great album, and possibly his best overall. That album was my introduction to Armin back in high school, so this is super nostalgic for me (I requested it at one of the school dances too).
Still holds up very well in my opinion - a big, meaty slab of pure, slamming uplifting, with a huge supersaw working against a chunky saw bass. Great track for dancing with lasers in the dark, and I hope to drop it in one of my own sets eventually.
There was also the Thomas Bronzwaer version from the remix album, but it's weaker IMO since it trades the oomph of the original for a boilerplate uplifting template.