Reply to CDJ choice help

Aloha,

I am trying to figure out what cdj i should buy to compliment my current setup that i am building. At the moment I have a Kontrol Z2 mixer and thats pretty much it. I need a cdj recomendation one that doesnt require an actual cd is preferable. I am new to this so I'd appreciate a simple explanation of why I should get a particular cdj.

Thanks!