Also is it a bad idea to use studio monitors with the CDJs+Mixer?
I mean, can the more noisy and mixed sound that comes from the mixer damage the speakers?
No they should be fine, just like normal speakers don't overload them.
I currently run my DJ setup through my KRK's, when I eventlually updgrade to a pair of Adam A5x's, i@ll still run the DJ setup through them.
Technics 1210 MK2 x 2 / A&H Xone:22 / AKG K618 / Mukatsuku Record Weights x 2 / Vinyl
iMac / Ableton Live 8 / Reason / Akai EIE Pro / KRK Rokit RP5 G2 / Maschine Mikro MK1 / NI Kontrol X1 MK1 / Akai APC 20 / Novation Remote 25sl Compact