The Tommee Tippee Closer to Nature bottles are terrific and you can get a Tommee Tippee breastpump so the bottle will fit into the pump, no need to decant from one to the other. My breastfed DS would only take these bottles, flatly refused all the others I tried.

If you are worried about BPA (chemical in polycarbonate bottles) then Mam Ultivent are a bit fiddly, but good, I used them with DD. I still liked Tommee Tippee better, they may now be BPA free.

But truthfully, if you want to exclusively breastfeed I wouldn't even have them in the house. Too tempting if things are a bit rough in the early stages.

I bought a very expensive electric breastpump for myself and I could never express...my breasts just wouldn't respond to the pump at all. It would take me 30 minutes to get 30ml no matter what I tried and I was always gobsmacked at women who could get 150ml in 10 minutes. So I would recommend hiring a pump first and see if you have the time, ability and inclination to express before spending the $$$ to get one of your own.

(In case you are wondering, the bottles I gave my DS had formula in them - I introduced a bottle of formula a day at about 6 months because I needed to be able to go out without him for longer than a couple of hours and leave his babysitter a bottle, but I still breastfed till he was 20 months).