I personally believe that the best bottle to use is the one your baby takes to. We've used all of those recommended. Our son loved the Drop-Ins (Target brand liners work as well as Platex) as did our daughter. We used plenty of Avent and Dr. Brown's as well (Burlington Coat factory is a GREAT place to get bottles and supplies). But, the drawback to Dr. Brown's is that they are difficult to clean. If you're working and tending to one or more children, it can be a pain to balance the time of all the components.
I'd recommend getting one of each kind that you're interested in and seeing which your baby takes to. Also, if you are nursing, it will be difficult for the baby to take a bottle from you initially. They know the scent of you while you're nursing and get confused by the bottle. We were advised to have either the father or someone else introduce the bottle to help with the transition.
Good luck. If you are able to nurse, you're doing something wonderful for your baby. Even when I nursed our son for the first year, I still had bottles available for pumped milk during the day when I was working and when we were out in public (and I didn't want to deal with nursing).