I have two 4x5 cameras at present:
1. Graflex Crown Graphic. Excellent press camera and works well as a view camera -- which mine must, since I inadvertently busted the rangefinder mechanism not long after buying it. But no worries, since I would rarely shoot it handheld, anyway. It's built like a tank and relatively light, and folds up into a little package that can be stuffed into a rather small bag. It sets up quickly: just put it on a tripod, pop the front open and the back unfurls with a metal hood covering the ground glass, making a focusing cloth almost unnecessary. Its main disadvantage is lack of rear movements. So it's not that great for shooting architecture, but excellent for portraits and other situations where you would want front movements but not rear.
2. Calumet 540 monorail. This gives you full movements in every direction, but it doesn't come off its rail easily, so it can be a pain to lug around. Some people carry it intact in a huge case; I flatten the standards parallel to the rail and stuff it into a large hiking backpack. Other minor disadvantages are that it doesn't set up as quickly (when stored flattened) as the Crown, and it doesn't have an integral hood, so I have to use a jacket or focusing cloth to see what I'm doing.