[sign up] vs. [sign me up], what’s the best way to name buttons?

I'm a bit confused as to what the best way to naming buttons is. And if it needs to be consistent with the instructions (voice of one person), for instance:

Example A (one person): Are you new to the website? "Name", "Email", "Pass" [Sign up]

Example B (conversation): Are you new to the website? "Name", "Email", "Pass" [Sign me up]

Can we play it as a conversation? where the instructions come from the website founder, and the buttons are orders from the user, as in Example B.

I know that [Sign up] is pretty standard, but if I use it, I have to be consistent through out the website with other buttons. And I'm not liking the [Do this] tone in buttons, it seems pushy.

Or maybe I'm putting too much weight on this.