toyos are a very nice modular system.
that means you can buy a 4x5 toyo monorail
and ifyou want to expand it to be a 5x7 or 8x10 camera
you keep the front standard and buy a new back and bellows and maybe a
new rail for the camera ( not to forget lenses if the lenses you will already have
won't be suited for a larger format ).
i use a toyo45cx and it has suited me well for many years, but i started off with
a graphic view II, a camera i wish i never sold. the graphic view II is a solid/well built
camera that can take 90mm (wide) to more than 210mm ( long ) and it will afford you
as many movements that you can imagine you would need shooting architectural photographs.
often times they come in a fiber box that holds the camera, film holders, lenses dark cloth, light meter
and the camera. they are worth their weight in gold!
i am not sure if you have poked around
http://www.graflex.org but they have a ton of information on graphic/graflex cameras.
good luck!
john