Don't be afraid to use emacs just for orgmode. It's worth it.

I think I'll really consider this. Which EMacs should I install for this purpose?

On Windows I'm using emacs from http://gnu.mirror.vexxhost.com/emacs/windows/

On Ubuntu I'm using this ppa : https://launchpad.net/~cassou/+archive/emacs

To have the latest orgmode version I use the `org-plus-contrib` package from : http://orgmode.org/elpa.html I'm not sure if you need to delete `lisp\org` first (orgmode is included with emacs).

I think you can also use git to keep orgmode up-to-date.

How about with Arch?

I don't know much about Arch.

Latest emacs version is 24.3 so maybe https://www.archlinux.org/packages/extra/x86_64/emacs/

Also, are the keybindings configurable so as to be coherent with Vim's?

I have no idea but maybe you could use one of the following package:

http://www.emacswiki.org/emacs/ViperMode

http://www.emacswiki.org/emacs/Evil

Do these affect the commands used by orgmode?