Pilot + 5 pax?
Need more details. Weight/baggage/range/altitude/temp requirements?
But there's really only AS350 isn't there?
Or if it is pilot + 4 pax then B206/EC120B/MD500.
How important is passenger comfort? If important then forget about MD500 and B206 leaving EC120B but if you want decent range and full people and bags then forget about that too and stick with the AS350.