Upgrade sarge

["John Fleming" <john@wa9als.com>]

Inexperienced question - I'm running Sarge, with newer ClamAV from
volatile and newer SpamAssassin from backports.  When I'm ready to
upgrade to Etch, I assume I don't need the backports and volatile
entries in sources.list?  Will ClamAV and SA get upgraded as part of
the upgrade to Etch, or is this more complicated now because the
versions I am using are from volatile and backports?

Any specific comments and advice greatly appreciated!

- John