I really, really don't care about avatars, and find that most of them are distracting to intrusive and project an image about their owners that's probably far from what was intended, (nastiness edited out ^^). Especially when it's the same avatar for 10s or 100s of posts. Include a link to some really interesting stuff about or, better, from, you if you need to, an avatar isn't it.
I'd vote C- None of the above: no avatars. At least make it so that we can disable them. And sigs, too.
More importantly, I'd like a forum that fills a whole screen, not one third of it. And a "read new posts" function that actually works. I've also given up on reading my forum mails, the interface is horrid.