I have been going crazy trying to decide which CDJs to get to add to my setup. (2 M3Ds & a DJM600).
I can get the following for the same price:
CMX-3000 or (1) CDJ-800
I'd like to stick to Pioneer because they are standard in clubs here.

CMX-3000 is a good deal for 2 players in one. I've read mixed opinions about it.

CDJ-800 seems like it would be much more fun to use, but on the other hand having only one CDJ is too limiting.

CDJ-100S' pitch is not as accurate as the newer players...

Please advise.

And will you be scratching?

Well I can use turntables for that if someone ever teaches me how to scratch. On the other hand the ability to scratch is also nice for cueing and other effects.
I am tempted to get the CMX-3000 for its size and mobility, but I've read many mixed opinions about that unit. How about CMX-5000?
Two CDJ-800 would surely not fit on my desk, and they would probably be sitting too far from the mixer (which is in the coffin along with 2 turntables).