Levii,
Hi, and welcome.
The setup you propose will certainly prepare you well to use pioneer club set ups.
However as you suggested, I would certainly consider saving the money on the mixer to get the cdj900s instead. Coming from a midi controller I guess all of your tunes are on a computer or hard drive, with the 900s you can share a single data source between the two players, research the prodj link and rekordbox for more info. Other forum members may be able to back me up on this, I'm new to pioneer gear myself so I hope what I've said here is true - but do some more research comparing the players.
Good luck making your choice, Loosh