Brief scenario: Planning to launch an app and I've landed on a very apt name. The .com is taken and the registrant isn't responding to e-mails (even to a reasonable offer) at all. The domain has been parked for years. The app is going to be web + ios + android. I am going ahead with the same base name of the app, and have 2 choices to use the webapp domain:

(1) append "app" to the name and make a .com [name]app.com

(2) make a .co. [name].co

Thoughts? I've gone through the round of "Let's not focus on only this name, let's try to find others" and finally got back to the name because it's so apt to convey the app's meaning to non-technical audience.

Thanks.