There are 3 versions
JR
Lite
Full
The JR is very stripped down and also very limited in Expansion. 5 modules max. Unless you only want a very basic setup, I would shy away from this one. Also I think you have to add the PM1 module to the JR to get ORP monitoring. Neptune just updated their website, and the nice comparison chart is missing, I'll see if I can get them to put the link back up.
The difference between the Apex Lite and the Full Apex is the 4 variable voltage outputs for Tunze or Dimming LED's.
For the vortech, you need the WXM module.........
Unless you want to do LED dimming via a 0-10volt signal, I would recommend the APEX Lite system for you. You can always add this function later if you decide to add.