Bottles are bottles at the end of the day, we all have our favourite brands etc but there isn't a huge amount of difference.
If you want to combine feed, then go for something with a more natural shape teat, like the tommee tippee closer to nature or the boots own brand equivalent. The tommee tippee ones are
here and come in an anti-colic version too
here. They are my preferred brand, and are often on offer in the supermarkets. If you register online they send you a 25% off voucher which is worth comparing. I haven't bothered with fancy anti-colic bottles, if a baby is going to get colic then it's going to get colic!
I used Avent with my son 8 years ago, and found them to leak quite regularly, so I wouldn't recommend them.
Along side bottles, you'll need some kind of method for sterilising. This can be cold water with tablets, boiling in a pan of water, using a microwave steriliser, or using an electric steriliser. Again, we've gone with the tommee tippee one, and the electric one as the bottles remain sterile in the unit for 24 hours. You'll need a bottle and teat brush to make sure everything is clean before sterilising.
A good way to shop around is to have a look on something like boots or mothercare online at the different brands, choose a couple that meet your needs, and then google the brand name and review to see what other parents have thought. Look at what else comes in that range as then you are guaranteed compatibility, so with tommee tippee you can get the steriliser, milk powder storage pots, bottle warmers, flask units etc that are all designed to accomodate the bottles.
Hope that helps, if not, just shout
