Some really great advice. I'm trying to learn things about the format for now, my plan is to take things slow with the RB67 while reading up on large format photography.
My shooting tends more towards landscape and architecture. I want the LF for both the resolution and the ability to do movements for architectural work. I don't have much experience in that, but I figured I'd use this as a way to learn. I think I would go with a 4x5 and something that is more portable. From my reading, I think think the type that might suit me best is a field camera.