This would appear to be a subjective question, one based on personal opinion. The central theme of "the Gift of the Magi" is about love and self-sacrafice...this question seems to be wanted to relate the question to you, personally.
Think about the person you love most in the world. What would you be willing to sacrifice for them if the need arose? The part of the question that is missing is level of need that requires the sacrifice. We would all, hopefully, be willing to trade more if it would mean keeping a loved one safe, while we might be willing to trade a little less if it was for some fleeting happiness.
When answering this question for yourself, don't get stuck on material objects...keep in mind there are many other ways you can make sacrifices for those you love: time, freedom, and health being three examples.