in case you didn't want to do a trade just for "the thrill of the trade", but because you need that money for the AG dolls, I'd say go ahead and sell them. it's always easier to sell something and use that money to buy something you want than to find someone who is actually looking for the exact stuff you have for sale
and has something which you are looking for.
I can't say anything about the value of your dolls though, I don't know that much about them, so I hope someone else who is more experienced with value trends of these girls will be able to help you regarding whether it'd be worth holding onto them for a little longer in hope of a bigger selling price (in case you don't actually need that money now, to be able to buy AG dolls with)