I don't really think it's Node.js-related. Under what kind of network are you and who is managing your firewall? Does it block any other ports in the same way or only 13130?
There is no "best" port for any application. They will all run equally well on any port (of course first 1024 well-known ports are reserved for things like HTTP, SSL, FTP and you shouldn't use them). There are some common ports though. If you have a web server on port 80, it's common to have some other web service on 8080 (node.js app for example).
I'd say run your node apps on ports which your network administrator can leave open.