Ben,
You're probably going to be using these headsets for a while so go for the best you can afford. As it's quite likely you'll be operating in remote areas for a couple of years you'll need something robust.
I used DC 10-30's for years. ANR was a pipe dream when I started. Ended up using ear plugs + the DCs when I was operating an Islander. They worked.
The DCs never let me down even after years of working in the Kimberley region in Australia. Heat, humidity, dust and salt didn't affect them.
They handled the abuse just fine.
Bottom line, protect your hearing at all times.