Page titles are the first element announced to screen-reading software
First impressions matter!
Provides a descriptive name for bookmarking page; and
Accurate description for Search Results
Title doesn't identify or tell who "Us" is
Acme Incorporated - Contact Us
Unique title, but does not begin with the most specific information.
Contact Us - Acme Incorporated
Title is concise, descriptive, and identifies site. Specific information is listed first.
Also think about the "tabs" in your browser, with multiple tabs seeing the most specific information first is helpful. vs seeing multiple tab names with company name first.