I have lots of questions: What is the best formula brand? Is Parent's Choice brand good? Or should I use a name brand? Also, I had originally planned on breastfeeding and pumping, but have decided to use formula, so I have several AVENT bottles. Should I return the AVENT bottles (haven't used them or opened the packages) and get a less expensive brand? Or should I just keep the AVENT bottles and also get some less expensive bottles? Can I use different bottle systems? Any other information on formula feeding would be perfect...my baby is due Dec.28th!!! Thanks, ~ECH