I'm in the process of designing a Joomla based site for a client and want to purchase aMember. Sure I'll have many more questions down the road...but first, what exactly do I need to buy? Do I purchase "aMember Pro ($139.95)" AND the "Joomla plugin ($40.00)"? OR, just the Joomla plugin for $40 if I'm only using it for Joomla? Thanks in advance for all your help!