Mm... I like a lot of those!
A: Hmm... really minimalist, very basic, but doesn't even come close to touching everything else there is to do on the site, or even what you can do with that gold that you've earned by posting. ^^;
B: I like this one much better than A. It gets into more of what you can do, and while mentioning the gold on the front page would be nice, you really can get into that more once someone is a member, maybe as a short tut before actually getting to play with the site. Moira had a new user quest at one point. But this one might pique someone's interest with things they can talk about. Maybe use something other than Rally as the middle image? I've never gotten the sense that Rally was all that popular.
C: I very much like C, but only as it pertains to the dress up crowd, of which I am one. Since that is one of the foundations of the site, this is a very important thing to stress. I also like the layout of it, and the humor involved, which is also integral to Gaia. ^^ Definitely like this one.
D: Yay, I really like this one. It touches on all the things that are big and hip to do on Gaia right now, but I would suggest maybe mentioning things that are less faddish in the chat bubble? Eventually the hype around all three of those things is going to die down and then it won't be relevant anymore. The layout is okay, but not outstanding. Can't give suggestions to improve it much though, sorry.
E: Uhm... I like the drawing? But it would do absolutely nothing to make me sign up except laugh. and maybe wonder who that artist was.
F: I like F, but I feel that posting/playing games and such is essential to being able to shop. Otherwise, this is a great layout and shows that you can strut your avi about in places other than the forums. I still like C or D better, though.
G: Not a big fan of this one, either, honestly. I know the userbase seems mostly female, but we do have a strong male fanbase, too, and females with male avis. A male avi should be an example, as well, or they could be turned off the site. o: And we want the guys here, too!
H: What I choose to dress up as has no bearing on "who am I, really" so this one is a no go for me. It sort of falls flat. ^^;
I: Now this one is nice. It showcases many avi options without being so blatant, and mentions other things you can do. Very nice.
In short, I like C, D, and I the best. But I still really like the big button. ^^ That one shows off Gaia's quirky sense of humor so well, and showcases the avis...