I would sell the S2 and buy a Behringer CMD 4A and an Audio 6 or 8 and an X1. Use the Behringer at home and use timecode when playing out. I'd also buy some USB sticks and download RekordBox, analyze all my tunes and practice on cdj's whenever I get a chance. Once they fix all the bugs in the Pioneer XDJR1, it wouldn't be a idea to ditch Traktor and practice on that at home, but it all depends on how many channels you need, your genre and your style. Those are all some pretty versatile budget options IMO.
It is kind funny how complicated technolog has made everything though. I thought it was supposed to do the opposite.
