Any special tool for testing a web chat application?

I need to test a web chat application.

I was wondering if there's any recommendations on a special tool
and/or approach that might be the best.

Right now I'm looking at:
Nessus
A full web application scanner (HP/SPI,AppsScan,or Cenzic)
A proxy for manual testing (WebScarab, Paros, etc)

Sorry if this is a silly question, but chat seems like it's smaller
in scope but harder for that initial automated scan.

Thanks

Ba

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