Agree - don't buy stuff :) A few bottles isn't a bad thing to have and you'll probably use them at some point or other, but even those you don't need.
I didn't have a feeding cushion with my first and I don't think you need one, but I did have one with my second and I liked it.
I wouldn't buy a pump - but I would research and decide which one I would like to buy. Then stick it in an amazon list or Pinterest board "Things for baby" and forget about it.
Reason being if you need to pump in the very early days you will often be loaned a hospital pump. If you want to pump later, it will depend how often you plan to pump and how much. If you only pump occasionally, a hand pump is sensible. If you pump a lot, electric would be useful. If you stop breastfeeding within a couple of weeks, decide hand pumping is more efficient, simply don't feel like leaving your baby until they are old enough to be left without needing milk - a pump would be a waste of money, and they can be hard to re-sell.
But if you do need it later, you can go into that amazon list and order it for next day delivery. Same with the tommee tippee machine. In fact, this is an excellent way to go for almost everything baby related that you don't know you'll definitely have to use within the first two weeks. Just wait and see if you need it.
Buy and keep at home - pram, car seat, newborn bed, clothing, nappy changing stuff, place to pop them down during the day, few muslins, couple of blankets. Everything else can go on that list :)