caching & revalidation, followup -- a question to proxy server

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My question is to current or potential authors of proxy servers
(or other caches).:

 Should a conscientious web server use a particular response
to hint that 
  a) this is subject to change -- so store it but always revalidate
as opposed to 
 b) don't bother storing this -- it's request specific?

For example, would a max-age=1,must-revalidate be a reasonable
way of signaling this (with a tiny chance of sending a no longer
valid stored response)?   Or should origin servers not worry -- let the
caches manage their disk space as they see fit?

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