Techno is used too widely.
If you want techno go for Carl Cox, Tom Harding, Mauro Picotto (That stuff)
(Mauro Picotto - Awsome)
Tiesto is a trance/progressive trance DJ/Producer
He was voted for best trance DJ last year.
He has also made some really good stuff:
Dj Tiesto - In my memory
Dj...