Dear Guy,
After reading all the suggestions I had this thought.
A sewing machine IS a very personal choice. One of the board members has the best idea.
Why don't you go to the Husq dealer, gather up brochures of all of the machines that would be upgrades to the Platinum machine you wife currently owns.
This way you could wrap up the brochures with a note that one of these machines is hers for the choosing. She can read about the features, decide which she really wants, and then she will know what she really wants before going into the store for a demo. It is hard to make a sound decision in the store if you haven't already done some homework. You become so dazzled by everything it is hard to really consider what is essential and what is not.
These machines are a real investment, so choosing carefully is so important. If your wife really studies the brochures, she will end up with the machine of her dreams.
I think you are incredibly sweet to support her hobby. She is a lucky woman.
Please let us all know what you end up doing and what machine you wife chooses.