I suppose in my personal case ... I was raised to follow rules. Now even though I have been known to run stray from the straight-laced path, I would need sanity, and I need beauty. Then again, I prefer smarts.
This is a really hard decision for me, but why do you say that no woman will have all three. I think that maybe your view of sanity may easily be related in ways to a girl's level of maturity ...
I know from personal experience that the actions that my girlfriend takes are very IMMATURE, but I wouldn't say that she lacks her sanity. At the same time, she is very intelligent, and very beautiful in my eyes. ... ... ...
I say I hit the jackpot, Lol. IDK