I do the same, but I already owned a copy of RubyMine. If you are looking for something free/OS, you can use IntelliJ CE with the same plugin. IntelliJ CE does not include a DB tool like RM, but being a ‘full IDE’, it allows more integration with the Elixir plugin.
For me, RubyMine and the Elixir plugin work perfectly fine with very little config (just tell it where to find Erlang and Elixir installs). The test runner and graphical debugger are great. Plus, I’m already used to RM for my day job. 
