Plugins to offer users?

We want to offer plugins for our users, so that they don't feel extremely limited by signing up with us.

What are say the best 5 - 10 or so plugins that you would suggest us installing for users to use?

I appreciate any feedback on this from other's experience in running a multisite.

We are hoping to get this open to our testers by Monday so want to get the plugins set up by then.