Are you sure you want a helicopter in the 7 - ton category? Are you planning to travel in absolute luxury or carry a lot of people? Do you have very deep pockets?
What about the EC 155?
It's very early days - very much broad scoping work at this stage.
High-speed cruise and range are high on the tick list; as is comfort. Needs to comfortably accommodate 8.
The Airbus 160 could well be a good fit too actually - Although new tech (proven design with plenty of flight hours is desirable = reassurance).
Mulling over crew resourcing but likely not much of an issue - client is very keen to hire and keep; so type ratings can be paid for as req'd.