I've seen him many times + have

In search of sunrise 1
In search of sunrise 2
In search of sunrise 3
Nayana
In my Memory
Magik 1
Magik 2
Magik 3
Magik 4
Magik 5
Magik 6
Magik 7
Magik 8
Parade of the athletes
Just Be

...all excellent. If you like Tiesto then you'll also love Paul Van Dyk (obviously) and Armin Van Buuren, seen then both many times too + have loads of there albums!!