[Zope] Zope Web Serving Options?

I have a zope 2.6.1 server running on windows 2000 and using the zope www server to run an intranet. I want to host out a public site with nearly the same software (zope,plone,etc) on windows. I need to decide what the best approach is. Do I use something like VHM and run Zope www server or should I install Apache 2 on Windows 2000? Any ideas on pros and cons of each? Performance is an issue so I would guess apache could be good for images,etc. Any other ideas on using the Zope server for a medium to low traffic public site? What about security of running public and private sites on same box?