Don't limit your self (and your wife).
The bell curves between men/female on the important proportions are largely overlapping, meaning that most female's really don't need a "female" model*. Perhaps pick a wide saddle (SMP or Terry).
* In many, many cases the only difference are crappy parts, horrible soft wide saddle, more spacers/shorter stem and a pink accent. The frames are similar as the male models.... the latter actually makes sense considering the smalll differences
So to sum it up; avoid female models, they are mostly a marketing gimmick.