The best bottle is the one your baby will take. Our son was breastfed for his first year. He liked Avent, Dr. Brown's and Platex Drop-Ins bottles.
In case no one else has recommended this, have another person try to introduce the bottle. Your baby will know your scent and will have a harder time understanding why they are positioned to breast feed.
With our son, it was a matter of finding him a bottle that was closest to the shape/feel of my nipples. We had to do a lot of trial/error to get there.
With our daughter, it wasn't an option - I had to stop nursing to start chemo. Babies won't go hungry, so your baby will adjust.
We made the mistake of waiting until the week before I returned to work to introduce the bottle. I wish we'd started around week 3 or 4 to transition him better.
My best advice - get one of each different kind to see what your child prefers!
Hope that helps.