Reply to opinions on setup

I'm running a S4 right now and I love everything about it. EXCEPT for the times I have to play in places where there is no room for a controller. I'm believeing of selling the s4 and replacing it with this setup: x1 + xone 22. Would this be a good enough to run a 2 deck setup? My main question is about how external mixer mode works. I know when I messed around with it on the s4, I wasn't able to use my faders but would have to use the external mixer. However the s4 was only plugged into 1 channel of the mixer so I wasn't able to control decks individually with the external mixer.

So basically I'm looking for a replacement set up with the following options.
-full control of traktor (x1)
-hardware mixer (xone 22)
-ability to record mixes (???)

Would I also need a soundcard? The s4 built in soundcard was pretty good, but I wouldn't mind having something a bit more higher quality. Do CDJs have built in soundcards? Whenever I use cdjs with the xone, I find that the SQ is much more pleasing, although this may just be a placebo thing.

Sorry if anything above doesn't make sense.