While Xitami was/is a decent server, Apache on Win32 is a preferable choice here as it would increase portability with UNIX Apache versions.
Apache on Win32, as available today, can be installed as an NT/Windows20000/XP/2003 service -- it runs great.
I also find Apache configuration to be a lot more sensible than Xitami's INI file scheme with various "edit this" and "don't edit that" files. You will also find better documentation, support, and extensions for Apache. In all, unless you have a good reason for needing the built-in FTP support, I don't know why someone would pick Xitami anymore.