As mentioned earlier, our babies were born prematurely. We wanted to use good bottles for them that would eliminate as much air as possible (to prevent colic). In the hospital, the nurses used Dr. Brown's bottles. The babies took right to it and had no problems or spit ups!
The inside mechanism prevents the air from going inside the baby's mouth and getting colic. The only downside is that it might be more work to clean, but these bottles are so much better than other bottles, such as the evenflo bottles.
My mother-in-law also gave us the Babisil bottles which are European bottles. These are more expensive (~$30) and I am not sure if you can purchase them in the US (maybe online?). They also prevent colic, spit-up, and gas.
The cool thing about the Babisil bottles is that the inside tube is soft and made of silicone. As the baby sucks the milk out, the tube shrinks and prevents air going in their mouth! Not only is it good for the baby, it's fun to watch hehe.
The other bottles we have are the Evenflo ones. They come in a 3-pack and are pretty inexpensive (~$4 @ Walmart). These are alright and as simple as you can get when it comes to bottles. The main problem is that the nipple will flatten while the baby is sucking on it, and he will have to release it in order for it to go back to its original shape and have the milk flow out again. We use them from time-to-time when we don't have any other bottles.
So the bottles we were happy with for the babies were Dr. Brown's and Babisil (if you can find where to buy them and you're willing to spend a little more!).