I ordered a 3XS Z77 Vengeance OC -with 1 or 2 upgrades- on the 10th of November and was given a build date of the 3rd of December. The build was started on the day given and I received an email saying estimated 4 days to dispatch. Next day another email saying build was in the next stage estimated day of dispatch.....still 4 days. AAAaaarrgh.
Anyway, upshot is, another email on Saturday told me build and testing is complete and it was being passed to couriers for delivery.
It's been a long wait but from what I've read here it's going to be worth waiting for. Good luck.