Well, if you are willing to switch to Serato and build quality is an issue, there is the MC6000 mk2 to consider. It does support Traktor (and I have used that combination with a mk1 for a year and a half before switching to Cross), VDJ and Serato now. Sound quality was good on the mk1 (16-bit) and has improved on the mk2 (24-bit). It’s built like a tank, very reliable and comes in a 19″ form factor. A lot of the complaints about the (cramped) lay-out have been rectified.
Just my two cents (I am biased, being a Denon afficionado though 🙂 ).
Greetinx.