I had a Sleepyhead, and we've just bought the next size up too. I think it's probably been the best investment in our sanity to be honest. I had a side-car cot that I made by hacksawing the side off the £35 crib from Mothercare. If we'd had more room I'd have just used a normal cot with one side off.
I had a stretchy sling which I used from the first hour I brought her home. Just strapped her on and got on with stuff. I had a buggy, but I didn't use it until she was about 4 months old - until that point I just carried her everywhere. I used it now for running to the supermarket, or for her to sleep in if we're out for the day, but I still pretty much carry her everywhere (in a Little Lives rucksack or a hip carry ring sling).
I think that if breastfeeding works for you, then a small tablet (something like a Samsung 7 inch) is a brilliant thing - you can read one handed, it's a light during the night that's not too bright, it's useful for the internet.
I had a hand pump for £12 for the first few weeks, which was fine. We introduced a bottle for one expressed feed at around 2 weeks, and all was fine. I know that this was lucky. At around 6 weeks I bought an electric Medela swing pump which was brilliant - I expressed for one feed a day so boyfriend could do it.
I didn't have any special chairs or pillows, but an ordinary V reading pillow is good in bed just because it's comfy.
We didn't use our monitor until she moved into her own room at 5 and a half months, so no need for one of those yet.
Clothes-wise I had 5 x coloured short sleeved vests, 5 x white ones, 5 x coloured sleep suits, 5 x white ones, 2 x cardigans and 2 x hats. I think that was it - she was in those clothes until she was 3 months old I think!!