LOL, I don't think anyone here mentioned 1 single techno dj/producer(haha at Justice playing techno). Just b/c it goes boom boom boom doesn't mean it's techno. Anyways don't bother with techno unless you like the slow boring minimal bullshit that's been going on for the past 5 yrs.
As others said, Dubstep is probably the fastest growing edm genre around now. DnB never gets old either...
As far as DnB... check out DirtyPhonics which is one of the hottest groups out now although they jumped slightly off the standard DNB and are headed more towards electro/dub.
Other hot new DnB producers/artist
Camo & Krooked
J Majik & Wickaman
SubFocus(one of biggest pioneers in the last decade)
DirtyPhonics live(and by live I do mean LIVE PA) 2 yrs ago...finally an MC that doesn't talk his head off.