I agree. Professional fitting is a must. And go to Nordstrom over Macy's. I'm a dd or d depending. When I was young, my mother had the wisdom to take me to a place that did prosthetics for women who had had mastectomies for my bra needs. At the time I felt like such a weirdo. In any case, it taught me a lot about bra fitting. So the other day, I went to Macy's for some new bras. The woman who was supposed to be the expert was HOPELESS. She kept trying to get me into bras that were too small. We're talking the bras that give you a double boob because the cup is too small. Thankfully, I had enough knowledge to know that wasn't right. But it's a word to the wise.
Also, I have had some success with Bali bras. But again, it's so personal that you should just try everything.
Oh, and one more word of advice from my mom. She always said to make sure, once you've found something that fits, to also assess how it looks with your shirt on. I've found that to be quite useful advice.