You can find VMware's official statement on the licensing here:
http://www.vmware.com/products/datacenter-virtualization/vsphere/small-business/compare-kits.html
If you hover over the right place, it will tell you:
No additional vRAM entitlement can be added to the Essentials or Essentials Plus kits. If more vRAM is required an upgrade to Standard or Advanced Acceleration Kit is required.
You can always buy, for example, one Advanced Acceleration Kit and several individual CPU licenses, but you may not stack the essentials kits together. I believe whoever told you that is incorrect.
Notice that vRAM != physical RAM. Are you planning on running your two servers in an HA environment, such that the allocated RAM will be < 128GB (or < 192 for that matter)? In this case, the Essentials package will be sufficient.