Another option is the Dynamite Girl line from Fashion Royalty. Their dressed dolls only run around $40 so you can find good deals around the net on bodies and nude dolls.
They are articulated well, have a fashion body and fit Barbie heads and clothes. I am not sure you can buy them in stores though.
They are the next to lowest tier in the FR line but are the best dolls and only dolls of Jason Wu I will buy.
Just a thought. I have Silkstone Barbie heads on those bodies. I also have some Silkstone heads on their earlier lines - Monsieur Z dolls. Same style body.
If you can find one...Joe Tai 12" articulated bodies are amazing. They also fit Barbie and are heavy and very articulated. But they are hard to find (again online) but if you do many times you can get the whole doll for not a lot. Well, since the designer just passed away they may become collectors items...so the prices may skyrocket. I didn't think of that. Err...
RIP Joe.