Xitami supports CGI, that enough for you?
For my purposes, it's the best server, how's that?
That's fine - with things like this I try and move away from an absolute "this is the best" to a relative "this is the best for my purposes" argument. I don't use IIS because I don't want to jam up my other PC, and plus Apache is what my target server uses, therefore I develop with that. If the target used IIS I'd set that up.