Rasul Allah (sal Allahu alaihi wa sallam) said: “A woman is married for four things: her wealth, her family status, her beauty and her religion/piety. So you should marry the religious woman otherwise you will be a loser.” [Sahih Bukhari]

Getting the prerequisite right is an important step towards making a success of marriage. Regarding the most important quality to search for in a prospective spouse, the Messenger of Allah (sal Allahu alaihi wa sallam) said that it is a woman's piety.

In Jannah every woman will be so beautiful that when a husband first sets eyes on his wife, he will stand staring at her for forty years so mesmerized will he be by her beauty. The important thing is to choose a wife who will make easy for you the path to Paradise.

Usually people look for three things in a woman: wealth, beauty, and lineage/family. But these things end with the life of this world. If you want to have these things for eternity then you have to make it to Jannah. The man is described as the head of the household, while the woman is its neck. The neck turns the head any way it wants. You want a wife who turns you towards Jannah.

Source: Daily Hadith