So far, I had em all except for the 800
The 100 is okay, it´s a basic player, has enough pitch, ain´t too big and not that expensive. Recommended if you have to go cheap.
I just sold my 500, and to be honest, I thought they were the weakest of the series. It tended to jump a little easier.
Now the 1000 is what you want to go for, if you´re serious about spinning with CDs. The first time I hooked em up, my thought was "wow, this is better than sex!" ...well it isn´t ;-) but it comes close! There is virtually nothing you can´t do with these babies. 24% Pitch, Instant reverse, Scratching and Hot Cueing functions, and you can backspin, scratch, rub and spin your tracks like a bat outta hell, and you will never bump into the needle - there is none :D If your fit with the hotcue buttons, you can even do semi-needlehopping. But the best thing is the CD will NEVER jump. I´ve used the cheapest of CDRs and I haven´t gotten en to jump just once yet. The CDJ-1000 is definately the best Machine out there and it really is capable of killing the vinyl and bringing DJs to the 21st century. The only major turnoff is the price. But it´s worth it - every penny