IMO, monorails are a true pain.
Too heavy, too bulky and overly complex for landscape use.
Disregard those eBay photos showing cameras with pretzel-like movements. In truth, you need very limited swings and tilts for most landscape "stuff".
For me, front rise is of primary importance, with rear tilt/swing coming second. In 4x5, image circle is not as limited as the ULF I shoot, so front tilt will be useful given a fairly modern lens.
Remember: the camera is just a box. A new, $600 Shen Hao will take photos as well as a $5000 Linhof if you put the same lens on it. Glass is so much more important than the camera. I'd suggest buying the cheapest camera that you can live with and put more research effort into your lens choices.