Pioneer is the standard in cdj's, and a lot of people would agree with me that they are the best.
Haha although their vinyl turntables have been unmatched for 30 years, you wont have to worry about anyone recommending you any cd players from Technics, since they are God awful. Avoid them like the plague, and don't let anyone convince you that they are worth the price.
Unless 5600 USD is pocket change to you, I absolutely do not recommend the DVJ's. Yeah, they are the best CD/DVJ's on the market, but I would only recommend them to VJ's, and even then, 95% of VJ's will tell you they would rather take a 1500 dollar laptop over DVJ's any day. There is no reason for a beginner to start off on DVJ's when they are many other incredible cd-players that go for a quarter of the price.
If you are starting out like I think you are, and are bent on getting pioneers, look no further than these:
Pioneer CDJ-400 Pioneer CDJ-800MK2
Either of these two make fantastic cdj's, but I recommend the cdj-400's over the 800's, based on the fact that they are newer products and its super easy to slice beats on it (Although its not hard on the 800 either). The only thing I would say the 800's have over the 400's is that the platter is double the size and the cue marker in the middle is pretty cool and handy, but you only really need to mark visual cues and have a big platter if you are a scratch dj. Since I prefer using actual vinyl for scratching, that's never been a problem to me, but its something you should consider.
Good luck
and don't forget to get a mixer (NUMARK!)