I don't blame her!
Its not just a computer its a piece of Art! I'm selling my house at the moment and most comments have been... "ooo you have a mac".
Heheh! May sound funny, but true... Most people get impressed when they see a Mac. Even at home, I only have a MacBook Pro with an ugly external monitor, but still, people can't help it, and just stare my MBP and the desktop. And when I move a program from one display to another, there's no doubt I would hear a "Wow!".
I also want a 27" iMac. In the OP's case, he should listen to his wife. He's very lucky. And hurry, before she changes her mind. Otherwise you won't see the end of it.
When looking for refurbished, make sure the price difference makes sense. A few 100's difference may not be worth it.