If you only want a tire to last longer and still have decent performance at a more expensive cost, my vote would be on the Heidenau K60 rear tire.
For me I like to balance cost per mile and not necessarily max miles.
I'm running a Shinko 805 rear right now. It was under a hundred bucks to my door. If it lasts me 5k miles then it's more than paid for itself. It's been an awesome performer as well in all aspects.
Givi Airflow, Givi crash bars.
Oxford Adventure grips.
Hindle Carbon Muffler.
Touratech handguards, Touratech skid plate.
Rox 1"x1" risers, RK Gold X-ring chain.