EDIT:
1. Let’s not make this a general vim/emacs debate. I know some people prefer standard emacs, I want a modal input system.
2. When I say Vim emulation, I mean something like http://www.emacswiki.org/emacs/Evil or http://www.emacswiki.org/emacs/Vimpulse
I edit a lot of text (as in notes, mail etc.), I want to do it as quickly as possible. It seems like a good idea to learn how to use something more complicated than text edit. Is there any significant difference between the potential speed of an experienced user of either vim or vim emulation X in emacs?
I suggest you pick one of them (VIM/emacs), mixing them (with a plugin) isn’t something that great since I wouldn’t expect all the functionality to be there.
Besides that, I don’t see any reason why you would need such a thing. VIM or Emacs are pretty fast without one emulating the other, so you wouldn’t need such a plugin.
If you really want to be extra fast, I know VIM has a really nice plugin called EasyMotion (watch a quick video of it in action from nettuts).
Edit: @Daimrod said Emacs has a similar plugin called ace-jump-mode