Being a "Dry Fly Nut", my favorite go to rod is my Green River "Jade"-Model.
An 8'-6" 5wt. that can do anything I ask of it.I fish with it for Trout on the western rivers, in Oregon, Washington, Idaho and Montana.
As to "what would you change?", there's not a thing, I'd change on this rod.
"If I could have any, rod, what would it be?" Another Green River,in their "Enso" line, in a 4wt.