I set up a new computer recently, and after installing Chrome, I was incredibly frustrated that searching from the address bar went to google.co.kr rather than google.com, presumably because of IP-geolocation. Took awhile to figure out how to fix it, but here's what you do:
1. Click the wrench, go to Preferences.
2. In "Basics", "Default search", click "Manage".
3. Add a new entry:
Name and keyword can be whatever, the important part is the URL. Then set this as the default, and you're good to go. If you want, you can copy all the other URL params and stick those in the URL too, but it's not critical.
This is also explained here, but it's kinda annoying that it involves this manual tweaking that most people won't know how to do.