Strike the Technics off the list straight away. Put simply its got problems, which affect the audio when the Pitch Lock is used during scratching especially and during basic "vinyl-like" handling eg: nudging/dabbing the platter to keep beat matched tunes in sync.
Technics have always claimed that the deck had user-upgradable software, via the SD/flash card port, but a quick look at the Technics SLDZ forum shows that users calls for software bug fixes have gone unanswered and unresolved for over a year.
Pioneer, on the other hand have released no less than 5 software versions rigidly programmed inside the un-upgradable CDJ-1000 - four versions shipped inside the MK1 over its 5 years of active retail, with the purchaser getting whatever software version happened to be current at the time. (if you hold down "loop out/exit) for about 5 seconds, it'll display its software version ID).
The fifth version of CDJ-1000 software was in the MK2, which also had the digital output socket upgraded to work even when doing "dj things" like adjusting the pitch/speed of the track, and the MK2 also got a 10% brighter display and a trendy silver rim to the platter.
If you're looking for a cd-deck with ultra realistic sounding and vinyl-handling cd-deck then take a look at the Denon DN-S5000 (just like Brian said I'd say)
Theres a review of it in the DJU audio reviews, and several DJU members use them.