I have great trouble prioritising items that I see and do or do not need. In agreement with my wife, I decided to create myself a list of the items I see day to day and think that I either need, or maybe just want.
Joanne can then ask, next time I demand that I need something, where does it sit on my list of priorities.
Good idea in theory, I will keep you posted on how it goes in practice.
By the way, list is a work in progress! ;-)