Isn't 2.0.0-p247 the system ruby? My rvm install was p195; after running "rvm use system" it's now p247 (ruby 2.0.0p247 (2013-06-27 revision 41674) [universal.x86_64-darwin13])
pythonbrew is actually the python equivalent of rvm - https://github.com/utahta/pythonbrew