There is no Torah obligation (as far as I am aware) for kibbud for a wife; however, in my experience, husbands tend to show a special honor for their wives. An example where this is frequenetly manifest is on Shabbos when the husband will often give a piece of challah to his wife before giving to any of the guests at the table.
My question is: if the husband's parents are at his Shabbos table, is he required by kibbud av v'eym to give them challah first? I am also asking the more general question: does kibbud av v'eim always trump kibbud for a wife?
Regarding honouring one's wife the Gemoro Yevamot 62b says
"A man should love his wife as himself and honour her more than himself."
ת"ר האוהב את אשתו כגופו והמכבדה יותר מגופו ..... עליו הכתוב אומר וידעת כי שלום אהלך
But there is a comparison between honouring parents and honouring G-d in Kiddushin 30b
השוה הכתוב מוראת אב ואם למוראת המקום
So I think kibbud av v'eim normally trumps kibbud for a wife.
Torah says "that a man shall abandon his parents and stick to his wife."
Maharik says that if a man falls in love with a lady despite his father's protests, he can ignore his father -- a strong marriage is a religious value, so his father is telling him to do something against the Torah!
Listen to Rabbi Willig's mp3 series on Kibud Av V'em for more.
A man has to honour his parents 1st but a woman has to honor her husband, that is why the gemoro says that her kiibud ov vo'em is not the same as his because she is meshubad to her husband before her parents
However the husband has a contractual obligation to honor his wife because he signed in the kesubah "ano eflach v'okir yoseychi"