The largest female I know of with the smallest breasts is the 68cm BBB Chun.
http://www.bobobie.com/index.php?main_p ... cts_id=174I know that's a bit shorter that what you're looking for, but with a pair of heels she could easily beat the 70cm mark. Or if you aren't turned off by modding a doll, she's the right price for a resin experiment and I bet if you were so inclined, you could probably extend one of the leg bits (maybe somewhere around the upper thigh mobility joint) to make her tall enough to get into the range you're interested in. Also, her breasts are still not what you would called small, but really tall women tend to be larger breasted anyway? But again, with some careful sanding, if you really wanted to you could probably be successful in a size reduction.
Personally I love my 70cm boy, a Dollzone Chen named Taavi. He was my first doll and since then I've headed towards the smaller end but I would never part with him.