I went back and looked at my response from May. OK, well, I have a new frame, still non-wsd, but it fits much better. It's an x-small Kuota Kebel, which is 48 cm. I also have new 38 cm Speciaized bars and new Ultegra short reach brifters. I can reach the brakes in the drops for the first time in 8 years! But, I think I could go up to a 40 in the bars, although I am 38 across the shoulders.
Reading all of the responses, I notice that almost all of the other respondents my height (5' 1") have wsd bikes that are 44 or 47 cm. Yet, when I had my Trek which was a 47, I still couldn't reach the brakes from the drops and my neck always hurt.
My bike shop guy is totally frustrated with me because I don't feel "right" on anything. I know, go custom. Well, maybe when I finish my degree. . .