I fly both (b430 and A109S) in Switzerland between up to 4000m.
The B430 is coming to it's limit at 2000m. the 250-c40 are not really done for hot and high. The A109S or SP are way better.
In view of flight comfort there is no other Helicopter who can beat the B430.
So if you don't have to go into confined areas you are good!