[Hampshire] Minimal X Install Advice Sought

Hi All,

Just wondering if anyone can assist with some info regarding a light
install of X on an Epia 5000-based box* running Ubuntu Gutsy Server?

<sean presents a straight bat to all of the grumbles about GUIs on servers>

I am quite happy with the mechanics of installing the packages, but it
is the selection of just the bare minimum required to run xfce4 on
demand (rather than at start-up) that I am after.

Cheers,

Sean

* 500MHz CPU, 512Mb RAM, on-board everything