I must say this is a tough one. I love so many. I used to like Infected Mushroom but they arent that great LIVE
although JUDGE JULES is stunning live !
PVD also is great !
Ima go with my current like which is Super8 & Tab

and Marcus Schossow
Must agree that Judge Jules live is a good night!
Saw him spin a house set in Leeds (UK) last year, and he has gone way up in my estimation - I wasn't a big fan of his before that night.
My favourite DJ's though, there are almost too many to mention:
Sasha (The 'King')
Hernan Cattaneo (the pretender to his throne?)
Steve Lawler (still a very under-rated DJ I think)
Scott Bond (responsible for Gatecrasher's style, along with Matt Hardwick)
Matt Hardwick (as above really)
John Digweed (along with Sasha, one of the Prog greats of all time)
Paul van Dyk (just a top trance/prog DJ, never afraid to play other genres too)
Dave Clarke (my fave techno spinner)
John Askew (has great energy, very good live)
Sean Tyas (as above)
John O'Callaghan (gets better every year, and plays pumping or mellow trance)
Tony De Vit (RIP - greatest Hard-House and Hard-Trance DJ I ever saw)