chances are that some people are still using 800px wide screens, which means that they will have the same problem you have been having with images 1024px wide.
If a picture of an insect is close enough up, and or cropped 640px should be more tham enough.
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[url=http://your_picture_server.com/garden/sunny_breaks.jpg][img]http://your_picture_server.com/garden/weather2.png[/img][/url]
this is an 800pixel wide image - you can click on it for an enlargement
worth considering that the bigger the images, if people are going for quality, then each one could easily weigh in at half a megabyte, which disadvantages people on slower connections. One page of your forum could be 8 megabytes, obviously not coming off your server or using your bandwidth, but still slow for the person looking at the page if not using broadband.
I guess that it really depends if you are adjusting this to suite the admin team, or the users.
You should be able to look in your logfiles and see what the most common screen size is, also how many people are using the smaller sizes. The most common screen resolution at the moment is 1024 x 800.
then 800 x 600, after that it all goes wonky with a whole gamut of screen resolutions some of them incredibly big and bizzare.
I run at 1280 x 1024, many laptops are wide screen (letter box shaped), and width here is what we are concerned with.
Anyway, I doubt that has helped you really, and I am sure that you know most of this already. So I'll shut up now.