The two seem quite similar to me, the main difference being the iTablet is just a touch screen and then ModBook has pressure sensitivity. You could probably find the proper panel for yours if you want the pressure sensitivity, I think that people have been able to use Wacom tablets that they slip behind the lcd screen - this would involve having a functioning lcd, and then the two are separate pieces. In that case, the best bet would be to get the lcd from ebay or an apple parts dealer and then the tablet panel from here:
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