If you decide you don't need to adjust the headangle, then either the Cane Creek 110 or 40 series are perfect. The 110 is a masterpiece indeed. The Angleset comes with a steel crownrace, if you can, order the aluminum crown race that comes with the 110-series. The seal and quality is much better.
I have no experience with Formula brakes, but I did read quite a bit about them. Very strong brakes, but reports stating that they are awesome when they work but a pain when they don't. XT/XTR brakes I've read have been the product of choice for the general population. I have Hope Tech M4/X2 brakeset currently and they have been solid so far.
Saddle is a personal choice, but I love the Specialized lineup, specifically the Henge.
Tubeless is indeed the shiz right now. Very easy to get setup, initially a bit of a learning curve, but a fast process once you are familiar. Going tubeless just add to the already plushness of the SL-R.