Why the devil are you even considering anything after about 1973?
With VERY few exceptions, late 70'* early 80'* cars are dogs! Sorry to hurt any feelings, and feel free to flame me on this fact, but that'* the truth. They were heavy, underpowered, and over-smogged.
Sounds like you have quite a conundrum - she seems to like sedans, you like wagons. You want muscle, she wants classic styling. You're hosed.
I suggest you go here: http://www.carnut.com/photo/list/list.html
and look at a bunch of cars together, then hope you can find one that you choose.
If all else fails, go with the ultimate compromise - a 427 AC Cobra. Ungodly horsepower, classic styling, and impossible to find.