Upgrading View 4.6 to 5.2 Certificate question

Hi,

I am looking for a bit of advice regarding certificates when upgrading to view 5.2. At the moment we are on version 4.6 and just using the self signed certificates, I understand that I will now need to purchase signed certificates for 5.2, we don't have an internal CA. We use a security server in the DMZ for external access. My question is what would be the best way for the certificates to be setup. External users will connect using for example. view.external.com but internally our domain is viewconnection.internal.local.

Thanks

Steven