Recommendations on Internal Team Wiki

I am wondering what anyone would recommend in terms of wiki for internal teams? My product team use Google Docs to store information about our product, our projects etc. and we'd like to turn these into a wiki with the following features: - Google docs support: we don't want to migrate our info from here if we don't have to - Access control: can we grant certain access to certain sections - Search - Secure: Google logins ideally I'm looking at YNAW - You Need a Wiki - but interested to hear about others.