For up to 3 tons, but not over, at sea level, probably the Bell 214B will be the best bet. All the real heavy lifters SASless mentions will easily lift more than this, and of course you'll pay for this extra performance.
If a slightly smaller maximum load is not an insurmountable problem, the Super Huey (205A++ in its various forms) is good value for money.
Lots of operators of both types, especially in the US and Canada.