I recall Digital Ocean lets you whip up a 1-click VM instance with OwnCloud all setup and ready to go.
As an alternative, you can just:
# curl -O http://vestacp.com/vst-install.sh # bash vst-install.sh
which would setup the entire LEMP stack for you (along with a full-featured, minimalist hosting admin panel) and then you can install any of the available file sharing tools.