Well i've used them all, and to me the most enjoyable player is DNS 3500 by far.
And with sys 99, the platform is rock solid
U can do so much more, the possibilities are endless!
Don't get me wrong the CDJ 1000's are a great piece of equipment, but they are much more expensive, and not as fun to play around with.
But as many already mentioned, it's a question of taste, try every player and make your decision based on your preference