Some good points in here. Some touch on sound facts with humor and others come right out and say it! You know here better than we do, at least most of us
(welcome to the forum) so you should have an idea that works.
I spoil my wife to the best of my ability. She deserves it. For years I have come up with unexpected suprises for her ranging from a few bucks to half the price of the my car. Romatic get-a-ways, etc. I don't ask much at all in return.
When I say the add for FFR it got me thinking. I researched and she knew I was serious. I brought up ideas and bargins as passing facts until she began to see the value to both of us. She convinced me to buy one finished because she was affraid she would have to have visitations rights to me if I built one. And she was right. There are a number of very good values out there. You can not build the car for what many sell for done. I saved thousands. The car may not be going up in value, but it sure as hell isnt loosing like the money was in the stock market. Speaking of stock market. It is my feeling that it has driven the price down of many 'luxury' items like Cobras on the used market. It seems a few years ago you could build one for yourseld and actually make a buck. The same does not seem true now. That could also be because of the increased numbers being produced over the last few years as well.
So work it, let her know you are serious. My wife never even had seen one in person and she LOVES it. We use it to get away and spend some time together. Always a selling point. Plus she will probably LOVE the attention that she gets in the car.