Sublime Text 2 came out on top, as my editor of choice, for its features, speed, and ability to use Textmate themes. Its not perfect or free (price) yet... while its in beta status you are free to use it (with minor nagware). To get started see below or download directly (more detailed setup instructions in my next blog post).
Ubuntu install via the webupd8 maintained repo
sudo add-apt-repository ppa:webupd8team/sublime-text-2 sudo apt-get update sudo apt-get install sublime-text-2-dev or sudo apt-get install sublime-text-2-beta
Install Railscasts theme
Place it here
.config/sublime-text-2/Packages/Color Scheme - Default
Preferences > Color Scheme > railscasts