Going to Timecode...

[funke]

You should be fine to just get the audio 6/10 + TSP2 and stick with your current midi controller to get started. Although, if you are set on a kontrol x1 you may be able to find one in a bundle package on ebay and save some $ in the process.

[funke]

You can use your midi controller as your mixer for using time coded vinyl as well as mix your regular vinyl in the through mode (even traktor's filters!), so no need to get a standard mixer right away. With my technics, I use my hercules controller for all my general mixing purposes and my x1 for fx and hot cues. I would recomend the audio 10 if you plan on making adjustments to your setup in the future, want to play at clubs, or have a particular mixer you would like to use, verus a certified mixer. Might as well go all out with your connectivity/playing out options if your already knuckle deep in it.