Hey Ash, welcome!
Personally, I would save up the extra € to get the XDJ-XZ, and here's why... the CDJ-2000's, while great, are 13 years old. I'll let that sink in just a second. ;)
The XDJ-XZ will give you much more flexibility in its stand-alone playback as well as software control for rekordbox and Serato, where the CDJs / DJM would only give you optional access to rekordbox with a paid subscription. A couple of years of that would end up at the same price as the XDJ anyhow.
Save up the extra money, get the XZ, enjoy its multitude of features!