Although not the canonical emacs way of doing things, I quite like using discover-my-majordiscover-my-major for that purpose because it just feels more effective.
It is available on melpa and is powered by the makey library, which is responsible for those nice menus magit is known for.
I'd suggest you check out the github link for a screenshot demonstrating the functionality.
Install it (I'd suggest from melpa using package.el) and add
(require 'discover-my-major)
(global-set-key (kbd "C-h C-m") 'discover-my-major)
to your config.
