I agree EVIL is pretty good, feels much better to me than Viper/Vimpulse. One issue with any Vim emulation in Emacs is the need to create vim-like keybindings for add-ons, like Org-mode. If you don't do this, and if you use many Emacs add-ons, you'll enter Emacs ctrl-key hell despite having decent Vim emulation.

Below is newsgroup thread with basics of adding Vim-style keybindings to Emacs/EVIL for Org-mode. I chose to make these sample bindings same as those I use in analogous functions in VimOrganizer. (I'm the author of VimOrganizer.)

http://thread.gmane.org/gmane.emacs.orgmode/52815/focus=5281...