Both the JVC's may use the TT-71 motor. Personally, I like the tonearm on the Victor JL-B37R better-- fluid damped. The Denon has the advantage of having a cartridge already installed. That may tip the value in it's favor. I don't think you could go wrong with any of the three.
If you can find one for only a hundred+ more, look for the QL- *7 series. They definitely have the more advance motor system. Victor entered the high end with the TT-71, TT-81, and TT-101 motor designs.
The Denon cartridge is just a cartridge, but all levels of styli are available for it. You could probably put a much better replacement stylus on it get a real winner.