-
For that kind of thing, the Yamaha PSS-A50 would be my choice. I got one for my then-10 year old and it's been pretty spot on.
RRP is £110 but probably more like £80 online.
The keyboard action is good quality (and velocity sensitive), it has a good amount of polyphony, and a recording function so you can overdub yourself (or put drums down to play over). Its arpeggiator is quite fun too. And it definitely does EDM-y sounds.
Full size or mini keys? Any idea of budget?