Pioneer DDJ SB2 or Numark Mixtrack Platinum

Both are good options. You are the only one that can value the features of each and prioritize which are more important to you and your workflow. Both will get you into the early days of playing out. Only when you are starting to play for money regularly will you probably want to upgrade. By then you will sure about the software you want to use, the features you need on the next controller and your decision-making process will be much easier.

Hope that helps a bit.