Rename SA account

Hi All,

I am sure many would have needed to do this (DISABLE/RENAME SA as per some audit requirement)

By default, all system DBs are owned by SA. I am going to rename the SA account. After this, I know the owner of the system DBs does change to the new "renamed" user. 

Is there any risk seen in doing this? I will be changing job owners from SA to SQL agent service account before renaming SA login.

note: I am aware of this known issue in upgrading sql server (http://support.microsoft.com/kb/968829/en-us)

thanks in advance...