$1K headphones with MP3s will make a much bigger difference than $50 headphones and $950 of 24-bit FLACs.

I listen to a lot of electronic music too, trance, future bass, melodic dubstep, electronic rock, some hardcore/hard-dance, etc. And I enjoy them on kilobuck headphones, and I've never found the genre to ever limit my enjoyment of those songs on fancy headphones.