Hi! Jumping in from new posts... Congrats on your upcoming LO!
My best advice is to buy whatever you can at the resale shop. Every baby is different as is every parent and you just won't know what you will use until the LO is here. Wait on the big things that don't get used right away and then see if you really need them.
But, for us, the very best were:
The Moby Wrap - absolutely could not live without this
plain onsies and little pants (for some reason I enjoy this combo more than sleepers)
I know a lot of people on here don't use strollers, but I really liked the "snap-and-go" that went with the carseat because sometimes you just have to run in somewhere really quickly and don't want to disturb a sleeping baby by getting in and out of the carseat for a 5 minute trip inside the post office or what-not, KWIM?
Medela pump in style - I am paranoid and like to have a freezer full of milk just in case something happens to me and I cannot nurse for a day or two.
bouncy chair - comes in very handy when you have to put the baby down
The worst - never used
pack and play
bumbo-type seat thing
Also, I really like the Earth Mama Angel Baby stuff for postpartum mamas and baby, too. I found their oil really helped DD's very dry skin.