On the road, and if you're DJing, you will want more bass than the SE535. For electronic music mixing, you will probably want more treble extension too (you will feel sibilance from SE535 when electronic highs slam).
So for IEMs I recommend Westone 3 as it exceeds both in treble and bass quantity over the SE535. If money allows, I would really recommend JH customs over universals any day (they have extremely good treble and bass extension, quality and quantity so they match electronic very well).
If it's a quiet place and if you're going to listen to pops, jazz, classic, then the SE535 will be better than Westone 3 or 4, but DJing electronic on the road is totally different. I'm thinking you will have speakers thumping behind you so you need bass heavy gear. I would even recommend headphones like HD25 for this situation.
Edited by zenki14 - 7/18/13 at 9:17pm