I got Snow Leopard to work with the Z3200 just fine. You need to throw away the old HP Printer Utility, the new one comes with the 1st Software Update you do after the Snow Leopard installation, do one right away.
The printer's panel is how you access the new HP Utility. The utility will calibrate the screen with the built in Apple screen calibration stuff, or if you have APS instralled it will take you to APS. So APS isn't free, I didn't understand that it would choose between the two.
However, I can't get APS running, it crashes, and X-Rite doesn't have a fix yet.