I'll go with some big names since you're new to genre, I'm assuming?

ATB
Tiesto
Paul Van Dyk
Paul Oakenfold
Infected Mushroom
Shpongle
Astral Projection
Hallucinogen
Benny Benassi
Juno Reactor
Tomcraft
Sasha & Digweed

There is a ton of good electronic music out there, but I enjoy singles and not entire artists really.