surmise: Haha. I think nature gives us what we can handle b/c at my height and weight now, I think a full C cup (which was what I was at my highest weight) would look really fake on me considering how I've leaned out. The B cup does have it's advantages, I suppose. I'm almost 40, have two kids and I don't sag at all. So that's a plus.
I agree, sports bras are essential to running especially. I wear Tekgear ones - I found them at Kohls. They have S to XL sizes. They really hold you in well, I've found. I think you should try it when the weather cools down a bit and take some photos before starting a running program and a few weeks after (sorry, don't mean to pressure you, lol). You'll be amazed at the differences in your body. It leans you right out. I noticed small changes in the first two weeks. The boobage may decrease though b/c breast tissue is fat so just a fair warning, lol.