Poll: which domain name do you prefer?

I'm writing a hosted Authorization service for my own web APIs.

In future I may offer it to other developers to allow them to easily add Authorization to their own web APIs. The server will be an implementation of the OAuth 2.0 client credential grant - machine-to-machine, but I may add other flows in future. Let me know your thoughts below.

I'm interested in which domain to use - see the poll below.