I am looking into Automating the Regression tesing of a MOSS (sharepoint) site.

Looking at 3 tools:
Selenium, QTP and Robot.

Has anyone got any experience of MOSS testing with these tools, any tips?

I have the same level of knowledge of each tool.
The test are all GUI point and click tests, checking for text, links etc.
Leaning towards Selenium, as it is lightweight (and cheaper, though not really an issue here)

So any thoughts?