We DJs usually use whatever equipment that is in the club. I do bring my controller in the club, they don’t mind as long as you play the music that keeps the crowd going.
I just checked the Mixdeck Quad that you were talking about, i think it’s quite neat, but I haven’t seen much feedback to it. Maybe you should let others buy it first and then ask for their feedback, you don’t want to be a guinea pig for a hefty $999.
The Numark NS7 has motorized platters but they are really big and expensive. They are the closest thing that comes to my mind when it comes to controller that emulates a CDJ.
Do you still want to go for CDs? I mean I started with Vinyl and CDJs, but I’m moving to digital… carrying all those vinyls and CD bags are quite a hassle. All you really need is to get familiarized with the CDJs motorized platters and the interface that’s it. Anyways, when you start earning your own money perhaps a DJ or something else. CDJs and Vinyl might be extinct already 🙂