Thanks for all the responses, everyone. If there are any more, I'd
still like to hear them.

Should probably add that
4) it's more for issue tracking/documentation i.e. code
versioning/repository is not a priority right now (though it's great
if it has that feature)

There will be discussions with the rest of the team and we'll have to
talk to the programmer/server admin to see what he thinks is easier to
implement, but we're likely to go with Redmine or Trac based on
recommendations/needs.