The cameras mentioned in this thread are all very, very different from one another. Don't spend too much on your first 4x5 camera, there's a good chance it won't be what you really want. It's entirely possible that the second one you buy won't be what you want either.
If portability isn't important to you, get a monorail. They're almost all cheap, they will help you determine if you like the format, and what you want in a LF camera. If you want something to take places, start with something that folds up. You may find that your first camera is perfect, or you may think "this is ok, but I'd prefer one that can do ____". Either way, it's a good thing - I don't think choosing the best LF camera for you is something that can be determined purely through research.