Acer, my opinion is go with 800 if it's not hard to do simply because it's a standard size. Then Stophel's stuff will come out clearly and he won't have any excuses. It's an in. or two wider on the screen as well which will actually allow more detail. Also, as far as I know, you can't resize a picture that's already been resized wothout impalations. You can't make an 800 into a 700. You have to have the original shot.
Acer, yes, these TIFF shots can be made into wallpaper or edited small.