if you want to know the difference between the CDJ2000 & and the 900s then this article pretty much sums up the differences http://blog.radio4by4.com/2009/09/new-p ... j-900.html if you wanna know the difference between the djm's im sure you can find a heap of articles comparing the two, personally though, I reckon that the 2000 is a massive waste of money, the 800 does the job perfectly but if you want something more recent then by all means go for the 900 it's just that it will cost a pretty penny