Reply to Modular Digital System

Hellow once again it is I, Mr.Skarzay seeking advice on all things DJ.
I'm looking to build myself a modular mobile setup( on a tight $600/R7000 budget) which requires a mobile mixer.The setup will consist of:
2xDenon SC2000+Berhinger CMD LC-1+Laptop+Sennheiser HD25 headphones+(X),whereas (X) is a placeholder for the mixer im looking for which is in similar vein to the NI Z2 though not at that price tag.