Avoiding source code on production servers

[Tonix (Antonio Nati)]

I'm in the phase of planning my new generation of FreeBSD servers, and I 
would love to make them more easy to upgrade.
Main problem I have currently is I do not want any source code on 
production server, so freebsd-update is welcome, but... what about packages?
I would use packages, but they are not easy to upgrade, while ports can 
be easy to upgrade, but need to have sources an servers.

What do you suggest me? What is currently done on other environments?

Thanks,

Tonino

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