SL-DZ would not be my choice

I have enough with the CDJ-1000mk2's.
It looks nice, but it's hard to work with. I prefer Digital mixing with CDs over tha analogue way. With CD you've got more precision, accuracy en possibilities.
DN-S5000 is a machine you got to learn to work with. It hold lots of features but most are hidden behind a second or third feature of a button. It's hard to get a hold of the DN-S5000, but once you learned to work with it there are lots and lots of possibilities to do.