Reply to Traktor S4 or Allen & Heath Xone: 42 + Audio 6 soundcard?

I finally got my job at a local apple store and already planning to fry my first monthly pay (still live @ my parents) on a new mixer, since my current Xone: 22 does not cut it for the way of performing I want to do.

However, I'm not sure what kind of mixer I wanna save for...I had my eyes on getting a Xone: 42 with a new soundcard (audio 6 or 8 if i manage to find one) but after playing around with my friends new S4, I seriously got tempted when i realized it would spare me from buying a new soundcard and software (since the upgrade to Traktor 2 will apparently not be free), although since I already own 2 Kontrol X1:s, it would feel a bit "too traktory" if I go for the S4 :P

I am however concerned over the sound difference from the two since iv'e been playing with my Xone: 22 and the fact i read somewhere that it's not a suitable mixer if you are playing techno / electro

So please, guide me to a good deal so I have something to look forward to