I have had IJ and still own a TZ. Both are really awesome for their time. WoZ is the next generation of pins. Where do you want to start? Deep rulesets, LCD Screen, Amazing Lights Shows, Best cabinet paint job out there (WoZLE). Not to mention working on the pin with that full LCD is so underrated.
In my mind the JJP pins are in a class of their own. I can't speak to TH though. I have only played several games. To me TZ is the closest pin out there to WoZ. Probably the combination of the magnets and upper playfield.
Either way, I think you would be very happy with a WoZ. We have had that machine for a couple years now. It gets three times more play than the next pin in my collection (MM, IJ, TZ, and WoZ).
Hope this helps...