The reason many monorails are cheaper than field cameras is that they're not getting used in the studio like they were intended for, and most folks who try them in the field find them to be something other than ideal for that purpose.
A Shen Hao 45hzx AT II is a great starter camera. I have one myself, and although I've moved on to other larger formats, I have no plans to get rid of it. It can handle wide-angle lenses quite easily, and with a bag bellows, you can use as wide as a 58mm lens on a flat lensboard. It does have a maximum 12" (300 mm) bellows, but this has not been an issue for me when shooting landscapes. When shooting portraits, it has been more than enough while using a 210mm lens, or even a 240mm.