Thank you for the answers.
@DJ Vintage
I understand your logic about buying something used and low budget and then upgrade with something more professional after some experience. However i’m not really this type of person. I already done this path one time and finally i spent more money then if i immediately went to professional equipments. Moreover i djing for over 15 years, even if controllers it is something new to me i want something that is interesting to study and challenging to learn. However i also understand that buy an DDJ RZ without any experience in controllers word could be not the right choice. Probably i will go with the DDJ RX to give it a try and then, maybe after 2-3 years i will upgrade to something more.
Considering the software, i know that go with rekordbox is not the smartest decision, however for me it is very appealing the idea to mantain my compatibility of the analyzed songs also on the other PIONEER gears. However another good option could be the DDJ SX2 that is compatible with both, rekordbox and Serato.
Finally the XDJ RX is more attractive in comparison with the DDJ series, because resemble more a standard cdj + mixer options. However i really want to explore the new possibilities offered by the controllers so i think i will go for one of these (a controller) also because i already have a MAC Book Pro that is able to run the software.
But as always, any suggestion will be taken into account.