Here's an article that tells how to measure your inseam and determine your saddle height. Use it as a starting point. Most bicycle companies websites will give you the standover height of the bike. Look at the geometry of the frame. You can also compare tt length, headtube height, etc.

http://www.active.com/story.cfm?stor...tegory=cycling

Another great article on how women's fitting,

http://www.active.com/story.cfm?stor...tegory=cycling