>Maria would be the perfect waifu, but she's a little too frigid and prideful. It'd be a chore getting her to put out more than once a month.
Nagi is so selfish and clingy, it'd go well for a while, but she would become a royal pain in the ass (again) fast.
Hinagiku? 3/4 of Maria's brains and competence, 100x her sex drive, and a confident, straightforward attitude make her the easy choice.
nice analysis. i was gonna say maria hands down but upon reading that.. i'm no longer certain.