Class VII has all of the best girls (Alisa, Fie, Laura), but I don't actually ship Rean with any of them. I'd much rather see Rean end up with either Towa or Elise. Something about the group dynamic makes it not feel right for Rean to enter into a relationship with someone from within Class VII. I really don't know why.
I will also mention there are probably two candidates aside from the ones I mention here which skyrocketed in quality at a later point in the game. ---
Congratulations to BK_Sheikah00, this year's guru to achieve contest enlightenment!