I use Beyerdynamic DT 880 PRO with 250OHMS on my DDJ-RZ.
They REALLY works like a charm!! Best headphones EVER, so clear sound and so nice over the ears in velour comforting!!
Hope this answers your question. I looked around to berfore I bought them to for answers but I can not recall were I found it.
But they can handle 250ohm with no problems! I use them every day! =)