Since you mentioned architectural photography and the shifting of focus planes when tilting, I'd recommend getting a yaw-free monorail such as a Toyo: http://toyoview.com/Products/45GII_45GX/45GII_45GX.html which can be found used in good condition at a reasonable price. You don't need all the movements of the above for landscape photography and I would suggest that you purchase a field camera such as the Toyo 45CF: http://toyoview.com/Products/45CF/45CF.html or AX http://toyoview.com/Products/45AX/45AXad.html for hiking/backpacking. I own and use all these cameras (the ROBOS instead of the GII/GX) and recommend them upon personal experience.
Thomas
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