Hardware requirements for VmWare ESX to run Virtual Service Edge VM's

We are looking to run Virtual Service Edge Appliances on VmWare ESX hypervisor. As we learn more about the VSEs, it’s becoming obvious that it’s better to allocate dedicated ESX servers as required promiscuous mode on vSwitch could chew a lot of memory resources.
Could someone recommend the hardware specs for physical servers?
There is another option with Physical Service Edge, but it is prohibitively expensive.

Thanks,