I agree the DDM4000 might be a bit overkill. Do you know of any 2 channel mixers with good midi mappability? The Ecler NUO4 is no longer available. The new NUO4.0 is not midi compliant (EVO 4 is their new 4 channel midi mixer and it costs a liver, a kidney and 6 pints of blood).
I aim to eventually get 2 x NDX800′s to have a good analog setup with the mixer but wanted to start off learning to play via traktor first so the first NDX800 will be my ‘controller’ to load up tracks on 2 or 4 traktor decks.