So if she likes those cars, does that mean she is partial to the 50'* style? Sounds like she likes something with some flair, while you want a nice simple muscle machine. That could be tough to mediate. I would then suggest taking a look at early 60'* cars. They are the era where cars kind of transitioned out of being all flashy and stylish and got more subdued. I think a '64 Galaxie might be a good one to check out. They have a little flair, but still have a simple muscular look. www.carsonline.com
is a good site to check out. You can easily choose by make and they are catagorized by years.
Of course my first choice would be this: