I have a little update for you all.
DH tried the avent bottles first. He got frustrated as he had trouble with them leaking around where the cap screws on. Apparently they have to be not too tight or not too loose. Next we decided to try the breastflow bottle from the first years. He only used it once so far, but he thought DS took it really well. I think we will stick with that one for a bit.
I still have my Dr. Brown's that we can try if we want to.
A ? for the pp: you wrote "the fat in breastmilk sticks to the disposable liners. She even advised against storing milk in freezer bags for this reason!"
What did you end up using to freeze milk in?