ResinSoul have dolls that apparently fit into Tonner clothes, but I think the proportions would be off.
A possibility might be an R&D Angel - they are what DoA designates "fashion dolls" but they are articulated resin dolls (incredibly heavy for their size and slimness), and are of a very similar scale and proportions to Tonner. Mine is an earlier model that had the color "painted" on and had a few issues with colour chipping, but newer models have the resin dyed all the way through and are fully customisable. I could try a Brenda Starr head on mine, if it would help?
Importantly, they're not hugely expensive - the website says $110 naked.
http://www.rnddolls.com/site/angels.htmThere are also the Dollmore fashion models, which are
lovely, but are taller at 16 inches so I don't know if the proportions would work. I've never handled one, so I can't tell you much about them. They are a bit pricier at $215 to $225 for an unsanded body, depending on whether you want magnet or tension arms, but still definitely at the lower end for bjds.
http://dollmore.net/shop/step_submain.php?orderby_bq=&research_b=&b_code=B20080522103756&m_code=&c_code=&pagenow=1 Vinyl-wise (which might be better with a vinyl head anyway), and most affordably - Horsman Vita might work. I don't know much about them except that they seem to be nicely articulated and beautiful bodies at 16 inches, and in December they are coming out with a nude Vita for $80, which makes them the most affordable option I could find. I am tempted myself, I need to figure out if they can squeeze into Gene clothes!
http://www.horsmanltd.com/ProductDetails.asp?ProductCode=28020