Evenflo. My daughter was fully breastfed and evenflo was the only one to have close to a nipple. It's the only kind of nipple.
Tommee tippee is what my sister used and she and my niece loved them ...you can also do mam, or the event latch are also good
I've read that the Nuk brand is good. The nipple is supposedly designed to be less likely to cause nipple confusion. Also, the way it is designed also has benefits for the baby as well. That's what I am using.