Ask HN: Best Enterprise Stack?

Hi Everyone -- I am setting a new company (not a tech focussed / engineering / product company) and am wondering what people have found to be the best stack for collaboration across the company. My needs specifically are:

1. Collaborative File Storage system (Box / DropBox / etc.) 2. Wiki or some other place we can collaborate on documents and keep organized.

Any thoughts? There must be something better than SharePoint for the wiki!