If you need it for Circuit Diagrams only, AC-LT is enough.
Put: design is more than circuit diagrams. In my procedure, Circuit diagrams are the last part of designing. I have to know everything else as field devices, locations, functionality, HMI, fieldbuses, interfaces, manufacturers, cabeling US/Other World standards.....
All for that, database is good help for data handling, linking to drawings, BOM produce etc. I have done own CAEE-system with integrated database. Now I'm waiting for new release of RM-Basic from TransEra Corporation, maybe after that I can sale it for someone else.