Ah, I'm talking about a fifth option: seeing a maximum of one avatar, with the url avatar taking precedence over the system. So you want to see url avatars, or their system avatar if they don't have a url avatar, but you don't want to see both at the same time. AFAICT that's not currently possible via the options.
Edit: Yes, I know I'm being picky, but if we are going to have url avatars of ~185 pixels in height, along with system avatars of ~75 pixels, we're only going to be able to fit a few posts in a screen, even if they are just one liners.
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