Mixtrack/Mixtrack pro – Traktor 2 duo/pro
Traktor S2- Traktor pro 2
For me I would go Mixtrack…. if you are really on a budget take a look at the mixtrack (no sound card version) is a good option. Mixtrack pro if you can spend 200+$.. In my opinion, mixtrack + a sound card like NI audio 2 or numark DJIO came out cheaper for me (or its just me)… but hey if you could afford the S2 go get that instead…
Software wise… I would go straight up Traktor… Traktor is such an amazing program to use… The flexibility and customizability is awesome. But if you do get the mixtrack pro Serato intro runs with it so, you could take a look at that software as well… On a side note, depending on where you are, Mixtrack will either come with VDJ or Traktor LE..