I'm guessing the role is to haul people around which is pretty much what everybody does with a helicopter. I have about 200 hours in the 109S and found it to be a solid aircraft. Fast and powerful but the set up was not great for IFR. The company I worked for had a fleet of 9 and they were reliable with very little unscheduled maintenance. These aircraft had between 2,000 to 7,000 hours. Parts didn't seem to be an issue. I do not know much about the Trekker but a nearby operator was adding them to an existing fleet of 119's so they can't be too bad. I feel the expense of operating an Agusta is probably more folk lore than fact. They're ALL expensive. The 135 would be a good choice as well. Never flown the 429 but the reduced GW of 7,000 pounds (because of a certification screw up in the U.S.) could be an issue.