Another thing that strikes me with what you're already doing already with 35mm and those ultrawide focal lengths is that you're going to be using MUCH smaller apertures to obtain the same near-far depth of field effect, which will almost certainly require a substantial tripod. So the difference in weight between a monorail and a press-type camera is only incremental, perhaps not as great as you may be thinking. It's also going to make you a lot less surreptitious in abandoned buildings to be slinging a tripod over the shoulder with a camera mounted.
Though it's also true that so long as the important subject matter exists in only one plane, camera movements can greatly help with the near-far thing and at wider apertures--even with a lens nearly wide open, and consequently with faster and perhaps even handholdable shutter speeds, unfortunately this probably won't work so well with small and light older design lenses that require stopping down to f/16 or f/22 for sufficient sharpness, of the type you might be restricted to with the Busch Mod D front standard having only a 58mm opening. Ground glass focusing and swapping out film holders is also nigh impossible w/o using a tripod as well.
So, for all those reasons, a press camera isn't ideal for architecture.
Heck, the way things stand right now, these days a whole Sinar F outfit incl a bag bellows and a couple of pro lenses might not sell at auction for even as much as your budget. If a monorail proves too bulky, technical field cameras are also good for a lot of architecture.
The key here and the reason why I picked a Meridian was for the back movements as well as front swings and the revolving back. Wista metal field cameras, Technicas, MPPs, Meridians (less than your budget, somewhat rare and collectible--took a year of looking to find mine) and perhaps a few wooden field cameras that may be beyond your budget have these moves, that can pull the converging lines and perspective back after a tilt or swing. Too, back moves alone allow swing and tilt movements of a fashion with lenses that have a smaller image circle (limited coverage as mentioned by aduncanson above) without vignetting.
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