Choosing a controller is a mine field! This us what I suggest:
1. Read 2012 controller guide which is available from the dj tips Facebook page.
2. Wait for Namm this month to see what’s new. Reloop have just announced a fine looking 4 chanel controller.
3. Look at phil’s excellent in-depth reviews on dj tips website.
4. Visit DJ shop and try your shortlisted controllers. I went to bpm last year to try them all.
My choice was Denon mc6000
Advantage
Solid metal unit with fab build quality
All the inputs and outputs you could ever need
Stand alone mixer
Top notch pro gear
You can grow with controller
I love it
Disadvantages
Not easy to throw into a backpack
Some with fat fingers consider it cramped but I have no issues
Of the three you mention, I would go with ns6, good layout with fantastic jogs. Disadvantage with all are they are all large controllers.
There are many good articles on the dj tips website to help with iTunes.
Happy controller buying!!!
Of the three you mention, I prefer ns6 because well spaced out layout, great jogs
Some consider