I'm also on the wall about this.
I have the RZ but debating myself to get the ddj1000.
My feelings are the 1000 has new displays and on board FX section
Whilst the rz has better FX chain controls but software only and more buttons....
I'll be using software obviously to navigate my tunes and the recent update gave rekordbox the same FX as the new 1000.
So it comes to this... functionality it's the RZ. Looks it's the 1000.
Tough choice still tho....