With modern materials like carbon fiber used for the camera structure, a monorail can be lighter than a 1940 Speed Graphic, competitive with a wooden field camera (some of which were astonishingly light) -- but carbon fiber structure isn't cheap. Probably the best combination of "light, inexpensive, and versatile (in terms of movements)" is one of those field cameras in "needs a little love" condition. By the time you're through fixing it up, you'll know all you need to know about operating it, you'll save a lot of money with "as is" listings, and those wood field cameras were about as light as anything with useful movements ever got for a given format.