I just realized I had a comment to add here, even though it has been a while. I was just trying to wear an older bra, and realized what has been making my current ones so comfortable.

I wear bras that are a little bit big and have thick padding w/underwires. The thick padding/underwire combo makes it stand up on it's own so that the straps don't really hit my shoulders too badly.

I am only a big C/small D.