Well I would prefer something sturdy to something cheap china plastic if possible, I'm willing to wait for a good deal (like how I got the toyo45a with rotating back, both PA-45 and PA-145 backs and linhof lens board adapter for $700 which included shipping).
So of those, which are known to be the most sturdy, and flat. I probably won't need the other size options but you never know of course... I would take the other size options if the back is a better choice.
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