There are also different springs (red and blue colors), which differ in 'springiness' (is that a word?). I have three of both, and different combinations yield different results. I stopped fooling around however when I figured it sounded good enough.
Anyway: the Studio and Studietto can still cut it today, although as Schipo already mentions, the lineair arm adjustment (especially VTA) can be a PITA. And try to get one with the JVC motor. It won't sound better, but that motor is repairable/replaceble.