Use a Mac as a Domain Controller?!?

Hello, I am just returning to Macs after years of PC-only experiences (argh!). Anyways, I am really getting fed up with all this Windows business, and I'm thinking about going Mac. My only abstacle is that I'd really love to have a domain/profile/logon server. I just heard that this is possible to do with a Mac. Does this setup look reasonable? All are connected by 100mb router Comp 1, Mac G4-->Stores usernames, passwords, desktop profiles for the network Comp 2, Mac G4-->Client comp, able to log on with passwords/profiles stored on Comp 1 Comp 3, PC (Win XP Pro)-->Users can log on to this machine with the same credentials as on the Macs Also, is there such a thing as a Macintosh Terminal Server (like terminal server on Windows 2k, 2k3 servers) Any help would be GREATY appreciated!