Here is an idea for you that worked for me: before Peter was born I was pretty confused about the whole bottle thing too. I bought most everything for him off eBay and while I was on there I searched for bottles. I found a lady selling about 8 different types of pretty much brand new bottles/ teats (she bought a whole range of bottles for her child but ended up BFing or going straight to sippy cup or something). Anyhow, I bought them for a great price and then had a range to try- DS liked the Nuk ones so we stuck with those.

Not sure if that was a one-off great buy or if there are others similar out there, but its worth a look!