What is your best recommendation for a DJ system to use in combination with this unit?

We recommend sets combining the CDJ-2000NXS2* and DJM-900NXS2.
By making a PRO DJ LINK connection through a LAN switching hub as the third or fourth player, the sequencer on this unit can be synchronized to beat timing analyzed or edited in rekordbox for performance.
For the connections, see the operating instructions.
*We recommend updating the CDJ-2000NXS2 to the latest firmware before connecting.