Reply to NEW dj, setup q

Hello everyone, i am new to the Dj world...
I have been screwing with vdj but am ready for a next step. A real dj setup, money is not a huge concern right now but i don't want to break 2k. Do i go with the Kontrol S4 or S2? What else do I need to buy? Keep in mind I was using VDJ for about a yr. so i have a broad knowledge of all of the functions of the NI S4 and S2.

THX, Jack