Fink is great. You need to get the X Window system (look under X11, I think, in the package database) and I personally recommend the rootless version and OroborOSX. If you want to do this, don't get a window manager using Fink, just the "base" X11 package, and then get OroborOSX - it comes in a more familiar OS X format. I don't know the website but a Google search finds it easily enough.
Good luck!
-the valrus