Welcome to this forums :D Hmm, I'll try to be as neutral as possible in this one....
The SLDZ only looks nice
The CDX is a nice machine with neat features and a natural working scratch'n'feel of the jog. When you're a fan of rotating jogwheels I assume that the CDX is probably the best choice for you. Scratch sounds good, Loop works well (allthough you cannot shorten your loop to just 1 frame (like Pioneer)) but it has some nice other things, at least it has a Cue/Stutter function (SLDZ doesn't).
If you're not restricted to a rotating jogwheel, the CDJ-800 is a good option as well. The scratch sounds as good as a vinyl scratch, the jogwheel doesn't rotate but I think that you can make more precise pitchbends with a non-rotating jogwheel. The MasterTempo is very good quality, the BeatLoop Cutter and QuickReturn are great for neat tricks. (more info
If I would stand up for your choise I would cancel the SLDZ and go for 800's