To the OP,
I listen to electronic music very often, and the first thing I'd want to know is -
do you want to listen on open or closed headphones?
I generally prefer listening to this genre on closed headphones because
it puts me in a place where I do not want to be interrupted by any ambient noise.
Also, I think that closed headphones go with the essential nature of the music.
With that said, though, in a very quiet environment good open headphones reveal
a dimensionality to electronic music that's almost impossible to achieve with
closed headphones.
I recommend the ATH-M50's as a start.
Excellent sound, reasonable price, very comfortable, good isolation, well made, and very resalable when/if you decide to change.
Coincidentally, I spent much of today listening to electronic music on my ATH-M50's
and Ultrasone HFI-780's.
BTW, while I really like the Senn HD I II and listen to mine quite a bit, I wouldn't recommend them
over the ATH-M50's for electronica because they don't project the same depth and bottom end.