I have owned two of your candidates, a Super Graphic and a Shen-Hao.
IMHO the reasons to go Graphic are two: 1) price, and 2) rangefinder.
I was quite pleased with my SH, which I don't hesitate to recommend to anyone who is satisfied with its bellows length/compression. I traded up when I outgrew its short bellows.
In re: durability, do you have a history of dropping/abusing your equipment? If not, the biggest risks are in the backpack, and getting it in/out. Consider addressing this issue from the other, backpack, side: get/build a sleeve of styrofoam or packing bubbles or something, that you can slide the camera into, so it is protected when carried.
A general comment on price/saving money. There is quite a bit of sticker shock in entering the LF marketplace, which lead many of us to purchase low-end, old, or used. Later we decide that it is a false economy, and buy what we really want/need, at a much higher price (rationalizations can and will be found). A better way to save money would be to skip the first purchase, since you will make the second anyways.
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