@MontereyJack,
I agree with California Cheese. The first sentence would be acceptable with the addition of e.g. "who is" or "who will be".
She wants to marry a man who is powerful and wealthy.
She wants to marry a man who will be powerful and wealthy.
Personally, I am glad I never met any women like that.
I would like to know the title and author of the "grammar book" where OristarA saw that information, and to see it quoted.