If you are going to spend the money on a gift like this, why not also do it with a promotional goal in mind. There are many of these types of gifts that can be branded, logo'd, etc. Now you can say thank you to your key people with a reminder of your brand for them to keep in their office, take home to their families, and for other individuals to see as well.
You could do a jar of candy, promotional chocolates or peppermints, or any other of what is sure to be hundreds of options that not only say thank you, but also promote your brand!