I <3 this thread, and wish more of our daughters would consider these factors.
I know, however, that I was against single sex education when I was an 8th grader looking at high schools, so I was not surprised that my own child had similar views.
On the up side, I realized that a childhood friend is now the head of one of the all-girls schools mentioned on CC. I would not have envisioned that back in 8th grade at the misfit/nerd girl lunch table, dodging the food-fight cross fire between the druggy girl table and druggy boy table.