At first: thanks for your help.
I decided to buy a ColorVision PrintFix Pro.
But there is one last question.
@Bill J.: Can I print the targets through the PS plugin? What I see on online reviews is that you have to print the targets with the ColorVision application. Are there 16bit adobeRGB files to print from PS and then to calibrate?
Sorry for the delay in responding. I've been out of town.
Yes, at first this stumped me, then I decided to simply find the test image and print it directly. ColorVision never dreamed of a "Print Plug-In", I'm sure.
You can find the test targets in a sub-folder of the ColorVision folder where PrintFix is installed (under Program Files on a PC). I opened it up in Photoshop, upscaled it for 600 ppi, then printed it through the Print Plug-In with Output Profile set to None. The files have no color space assigned, and I left it that way. That's one thing I'm unsure of: should you convert the target to AdobeRGB if that's what your photos will be? Since I don't believe PrintFix Pro assigns a profile if you print the target in PrintFix (using your printer driver), my guess is that you don't covert the target to AdobeRGB first. If anyone knows for sure, I would rather be corrected than remain ignorant.