I usually don't buy bras online, but I had been looking for a really good sports bra for when I horseback ride, and came upon this one.  I loved that it had underwire (no uni-boob!), and that you could adjust the band.  The first time I rode in this bra, I was amazed at how I wasn't thinking about my chest, and could focus on my riding!  Finally, a bra that truly controls motion and offers support for those with larger chests.

I see a few people have complained about sizing, not being able to get it on/off easily.  I suggest you measure yourself CORRECTLY prior to ordering (a quick google search can tell you how to do it).  I found that this bra fit very true-to-size with my measurements, and I got the same size I wear in regular bras.  Yes, it fits tight, and I wouldn't want to wear it all day (it is a sports bra, after all) but for a few hours of exercise, it is superb.