I am thinking about converting our self-signed certificate to a 3rd party CA as we get ready to convert our mobility server from Beta to production. We have about 30 "test" users currently. What potential issues would I have if I changed the CA? Would the phones all need to be re-initialized? I am also looking for opinions on who the best choices for CA's might be (Verisign, Entrust, DigiCert, etc).