Reply to Mixer/Controller Questions

So I have scoured the internet looking for the answer to my questions but haven't found anything so I figured you guys could help.
I am currently using a Mixtrack Pro and my Macbook, but I would like to transition to a CDJ and mixer set up. If I were to buy a MIDI mixer (DDM4000, DJM 850/750) and an audio interface, could I use my Macbook with Traktor as an alternative to buying CDJ's (because I am a little low on funds) or would I need to get something like a Kontrol X1 to use as a player?