I've never tried any of these out but when I was researching for my own controller, I came across XP5, XP10, VCI-300. The Otus should be very scratchable because the EKS also made the XP5 and XP10 which according to people who own them has very good jog wheels. The NS7 was intended for turntablists who wanted to transition into a digital medium. http://www.youtube.com/watch?v=PLjlJ-xKpWI Check this one video out. The only problem is that it's going to set you back $1500 or so.

If you want to go the cheapest route, XP5s are the ones to go with except you're going to have to buy a mixer. The going rate in Toronto is around $250 for the pair. XP 10s should have a stronger build but They're nowhere to be found in Canada but maybe you can find them where you are. I'm not sure what the prices are since they're not at the stores yet but the Otus should be the same deal as the XP5 and XP10. If it lives up to the hype this should be a very good controller.

The VCI-300 is a good solution since it has a built in soundcard. Everything you need to mix is in one package. The NS7 is an all in one package as well. I've yet to test it out at the local store but it seems a lot bigger than the VCI-300.

Portability and upgradability was an issue for me since I only take public transit. That's why I got the VCI-100. The same size as a 13" macbook and I am able to pick my own audio interface. I could easily upgrade my setup to another controller or audio interface. I've never tried scratching on it but here's a demo http://www.youtube.com/watch?v=b2Y509VQVEQ. The general consensus is that the VCI-100 aren't that great to scratch on.

If you are concerned with the price point of the NS7 and need a controller to scratch on, I'd honestly recommend 1200s. I've seen them used going as low as $300 for the pair and another $300 for Traktor Scratch. If you really wanted to add midi as well just use Traktor Pro. Hope this helps!