I know it costs a lot of money. Since may i've been checking this site
http://www.musicstore.de/en_EN/GBP/DJ/cat-DJ from the music store in Cologne. It sells almost everything. I've searched a lot on youtube too, looking how it works and which one works the best.
the reloop digital jockey 2 interface EDT (traktor le included) still looks interesting to me. it looks pretty decent, and is not too expensive (300 euros).
i think i'll start with this one, then later, when i'm getting much better at mixing and stuff, i'm going to spare money, to buy mixing stations who can work with cd's and digital as well, with additional mixers, so i might work in clubs as well.
Can you use your digital controller and traktor programm to make new music (like mixing an old disco or soul song to a new mixed house song)? or do you need a special programm for that?