My version of node is always v0.6.1-pre even after I install brew node and NVM install v0.6.19.
My node version is:
Expanding on Dominic Tancredi's awesome answer, I've rolled this into a bash package and stand-alone script. If you are already using the "Back Package Manager" called bpkg you can install the script by running:
bpkg install -g brock/node-reinstall
Or you can have a look at the script on Github at brock/node-reinstall. The script allows you to re-install node using nvm or nave, and to specify a node version as your default.