But other than the fact that a PC is the most inexpensive machine you can get, any platform is really fine for running a Web server. O'Reilly's Website has a lot of tools built-in that help development and management, but they may not be extensive enough for you. My list of major servers includes documentation on security support to help you find the server you need. But it requires some research in any case. You shouldn't begin such an undertaking blind.
Development tools are also important.
Editors are common enough, find the one you like and but it, if you haven't already. You probably have a number of those you already have too. So that leaves only management stuff, like server mappers and the like. The beauty of the setup is that server installation is really mostly turn-key now. You should have a good design structure already, since you should have all your pages setup.