Carbon addiction! Carbon wheels are absolutely worth the upgrade, as fat bikes suffer from heavy wheels serving as giant gyroscopes. Suspension fork is another must. I went with the Bluto setup, as it has an arch in the front, opposed to Manitou in the back. That's where the arm for the bike carrier rests and if it was in the back, it would be scratching fork stanchions.
Groupset is where I saved a bit, planning to upgrade anyway. Shimano Deore 1x10 setup works perfect as it is, serving up crisp...