This little piece of beauty has saved me so much money over the years. At $119 for the version pictured it's been worth it 10 times over in rock and log strikes that would have wrecked chains in rings. If you're weight conscious, MRP makes a carbon version for another $50.
Kore has a wide range of 1X rings and rear cogs that'll make the climbing easier. Not to mention one empty bottle of Whiskey #fullthrottletoemptybottle