Getclicky can probably provide you with enough data, especially using the API and it is pretty affordable.
If you need to track activity on the page then Clicktale, but that is a little more pricey.
An alternative to Clicky is Woopra but it is much easier to set things up with Clicky (at least in my experience).
A lot depends on if you need to somehow use the data live to modify the site, as if you are using cookies, it can all be included in your server logs.
