I like #50 and #55 a lot more than the "@" symbol.
Integrating the progress indicator is interesting. I hadn't thought about stylizing the "o" before, but I like how that's more balanced than doing something with the E or the a.
Do you think you could make the tagline/slogan a bit more prominent? I want to make sure that's easily readable when people see the site for the first time and don't know what the site's about.
I think #123 looks great, otherwise. I didn't expect to like a gradient in the type, but I do like it on this one.
What would you suggest for a favicon for this design?