Yeah, FL Studio. Drum samples are all wavs, got 'em from torrents, various house dj collections, very good stuff - hihats, base drums, claps, percussion. And for other sounds I use mostly VSTi or wave files which I sampled from somewhere.
As for Traktor, I am still not so versatile with the midi keyboard and did most of the mixes with a mouse (and in Germany, while on a business trip). But in a club it is no good if your face is in the laptop and besides with a midi keyboard you can do several actions at once. And working with a midi requires mechanical practice. And a suitable midi controller too. I now have M-Audio Oxygene 8 v2, which is alright, but I miss some knobs and sliders.