Once every year or two, I realize I hate all my bras, and go looking for a better, more comfortable solution. The Wacoal underwires (with no metal on the side) were the best bras I could find. I'm a 38g, so I prefer the support be on the band rather than on my shoulders.
This summer, in retirement, the underwire felt like a torture chamber in Chicago heat, so I went looking for wire-free bras. Mostly, they felt like sports bras, a lot of elastic and thick fabric. My next trial - and total conversion - was of the seamless bras like the Calvin Klein Invisibles line. They are definitely not as supportive as underwire, but since I'm not going to work everyday, I find I don't care. They are so much easier on my shoulders and my back than regular bras, both in terms of putting them on and wearing comfort. I now own four or five in different colors, and I put them on after a swim and feel glorious. I don't have prominent nipples, so I take out the foam cups.
Chantelle now has a line of bonded bras in a million pretty colors and I am going to try one of those next.