Mashine or Vestax VCI-100 SE.....

[audioel]

I own Maschine and have used it a lot as a controller for Traktor. Its actually a really good controller - even with the default template out of the box. It's a very different approach than using a controller that emulates a mixer/decks setup. Its really suited for using Traktor with an external mixer, and using it to do cue juggles, looping, effects, etc.

The visual feedback of the lights, the large displays with multiple pages of endless encoders, and the really nice feel of the pads make it a better controller than any of the other more inexpensive pad controllers I've played with. The only one that comes close is the Korg PadKontrol, but Maschine has far more controllers.

Plus of course, you can use it with Ableton, and with the Maschine software as well. I've sold off most of my other controllers and just use the Maschine now.

Edit - forgot to say that if your computer is powerful enough, you can also run Maschine on it at the same time, and easily switch between using the controller for Maschine and Traktor. It's awesome for keeping it on loop record and doing real-time additional percussion and fills.