If you wanna go with the Cane Creek 40 series. Then I will advice you to buy the Cane Creek 110 Crown Race separate. I'm planning to do that myself, when I begin to build my bike.
The Cane Creek 40 series is all aluminium except the crown race, which is steel. When steel is rusting, it causes aluminium (steerer tube) to corrode when staying wet. The Cane Creek 110 Crown Race is aluminium, and it got dual sealing.