The importance of a great fitting bra

I have been reading some of Trinny and Susannah's books recently and am reminded of the great importance of having a bra that really fits you. Most of us have probably heard this over and over, but have we actually gone out and figured out what bra actually suits us the best? I've gone and tried several on, hoping to get it just right, but am never quite sure. I know that there are those people out there who can help me, but who are they and where can I find them?

I was going to procure great jeans in this valley, but first things first, we all need a great bra. Over the next little while, I hope to find what I'm looking for, and I will share my findings. However, if you already know the secret, or have any great suggestions, please comment and share it with the rest of us!