You might want to look into the Specialized line. I am 5'2 and ride one of the Dolce's 51cm which is not the smallest size. The regular Dolce suggested price is $800 but it has Shimano components and is also on the lighter side. You would be getting a good value bike for the money. I think this link should bring you right to the Dolce page. I am sure you will be researching and comparing so I just thought I would offer you my 2 cents.

http://www.specialized.com/SBCBkFamily.jsp?sid=05Dolce