I think you are better off discussing this with your Accout Representative, because I cannot comment on costs and benefits. I can only tell you how the licensing types work. There are many licensing options available and in some cases they can be mixed and matched. We have a very flexible licensing structure. Not one package fits all scenarios.
Im not sure what you mean by al carte, but I think you are referring to the traditional type license where you are licensed by what feature, and agents you want. Normally with this type of license the amount of data protected is not a factor.
CLA is licensed by front end TB (application size). Features and agents are bundled with this and usually allow unlimited installations of agents.
Dedup by Active store is licensed by backend (data written).
So right there Ive mentioned three types of licenses.
If you dont know who to contact, Private Message me your CSID and contact information so I can make contact for you.