[King of Snake]

a little more info on what you want to do exactly would be handy.
Right now there are a couple of basic options for a "digital dj". You can go for something like Traktor or that software you linked to and use it with a midi controller. Then there are the various timecode vinyl- or cd controlled software like Traktor Scratch, Serato Scratch Live or Stanton Final Scratch (these manufacturers and their original naming schemes...).
And then there's Ableton Live which is great but totally different from the more traditional mothods mentioned above.