Interestingly enough, I spent about 30 minutes on the phone with Nathan from Pentair earlier today asking 20 questions about their automation systems.
** disclaimer: this is my understanding base on reaserach to date and conversation earlier today - please do your own research to validate **
First up, they have EasyTouch which is the more basic version and oldest of their systems. There is additionally a "light" version of indicated but the letter "L" in the name - for example, EasyTouch 4 or 4P versus EashTouch 4PL of 4PSL
The next rung up the ladder is their IntelliTouch which is newer than the previous version but still older technology.
Finally, their is the IntelliCenter which as mentioned above is their current flagship model and has their newest technology.
Seperate from this, they have their communication platform/interface (my words for lack of anything better). It allows communication with the automation system either through computer or phone app. This bolt on solution works with the EasyTouch lineup and the IntelliTouch lineup. It is not necessary for the newest IntelliCenter which not only has a digital display on the unit, but also has the communication intelligence for computers/phone app already built in.
Based on my application, which honestly I'm still trying to plan out, my rough math puts me at $1,000 vs. $2,000 vs. $3,000 in very rough numbers for the three different systems listed above. Good luck - I'm going to continue my research here on TFP.com!