I just had a fitting done at Macy's, smartest thing I have done in a long time!
As a C you might not have as much of a problem, I'm 40 DDD .. not much in stock.
For me the Lillyette brand (part of Maidenform) fit nicely and are made well. I tried the Bali (division of Playtex) and found they weren't made very well and the material was scratchy.
You will have to try on SEVERAL brands and types before the "ahhh just right" moment arrives.
I've heard great things about Wacoal bras. The sales lady told me they are guaranteed for one year, just rbing them back to Macy's for an exchange! Recommended by Oprah and was featured on The View. But they are pricey at Macy's at $46 to $70 each and no special promos.
I already had found 2 of the Lilyette and they had a buy 2 get one free so I went searching for just one more.