Can you access your site with ssh? the use the command : ls -all to see the owner.
You can also use winscp (http://winscp.net
=> free ssh / FTP tool). There you will see in the browser window the owner.
Also notice that you should set it to readable after you have completed the configuration of the META data fields. Otherwise the fields can not be update in the related XML files.
I am on a shared hosting environment and do not have SSH access. Not sure at all what the owner says, usually it is the "name" of the account. Usually if permissions are set to nobody i have a lot of problems and have to email my host to set them to the proper owner.
Would 400 work fine for security after I have completed configuration of the META fields?
Or is there some question I should ask my hosting company so you can give me the correct values?