While I agree with much of what has been suggested, I'll take a different approach, which may lead you in a different direction, camera-wise.
The uses you describe, Ara, are sort of at oppsite ends of the feature spectrum. For architectural work, you'll want a wide lens for much of the work. As importantly, you'll also want a short rail. Cameras like the Calumet, older B&Js, etc. that have fixed end caps on the rail will be a pain in the chest (or, someplace farther south). For table-top and macro, you'll probably want a normal or slightly long lens and as much bellows extension as you can get.
Thus, I'd suggest something you can swap the rail, as well as having interchangeable bellows (bag for architecture, long pleated for macro).
Used Toyo 4x5 monorails are a good balance between function, build, and economy. Plus, there are different rail lengths available. Some rail models can be screwed together to give more extension, and there are long bellows available, too.
The Sinar and Arca Swiss cameras offer greater flexibility in some cases, but at more of a premium price.