I am going with the avent.. hopefully six for newborn will be enough to get us through the first month..
Newborns eat every 2-4 hours, so it really depends on how many times do you want to wash...I would start out with just a few, until you find one that works best for you and baby.
do you also use the perfect prep machine by tommee tippee?
I've read 50/50 reviews on it, and I was just curious.. I can't really find anything else like it, but it seems fairly new & like they may have some adjustments to make on it..
I have bought 6 tommee tippee bottles, i had the same with my daughter and they were enough and lasted her for ages, you can always buy different teats too with quicker flow as they get older. I dont think you need anymore, you have plenty :)