A lot of people have 22"+ monitors (myself included), however I'd argue that a very large portion of users are using 14" laptops with a horizontal resolution of 1440 px. Add the sidebar for the forum and the likelihood of having the window be less than full screen (multitasking), and I think 800 px is decent. Maybe we could have the 800px image linked to a full resolution image, although that would be time/space consuming for whomever is setting up the threads
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