I bought the DDJ-200 about a month ago to see if I would enjoy DJing for a long time and if I could do it at all.
To be honest, I think it's great for a start, but since I've really been spending a lot of time with it since I bought it, I'm now thinking about buying the DDJ-400.
Which is why I can give you the tip to invest a little more right from the start, then you'll get something out of it for longer.