I hate people who say all this stuff is the same and that bull$hit. I can tell probably 50% of all Trance/House etc songs from about the first 5 seconds, and I'm not kidding! There are so many differences.
Darude, Cosmic Gate, Scooter, Prodigy, Chemical Brother (mixes), Junkie XL, Orbital, Oakenfold, Robert Miles, Santos, Hatiras, Faithless, Lasgo (similar to Ian Van Dahl), 4 Strings, Paul Van ***, ATB, Kernkraft 400, 666, DJ Jonah, Salt Tank, York, Planet Perfecto, Yomanda, Lucid, Lucid, Sash!, techno remixes of classical songs, Orbital, 808 State, Lock 'n' Load, Highgate, Ratty etc etc.