Nail clippers, for me, were a no-go after I got DS once on the finger. Look for cuticle scissors in the nail section of any store, these are sharp, curved, and allow alot more control and you can see what you are doing. I find it far easier than clipping.
As far as carseats go: we have a convertible (Combi Cocorro) which the only negative thing I can say about it is that I don't like adjusting the strap height, which I have only just did recently, and DS is 7 months old. It has a really cushy infant insert and is good from 5 lbs +. We took DS home in it from the hospital, and he was 6 lbs 14 oz. We also have a bucket (read infant carrier sort of carseat) for DH's car. it is convienent for shopping trips and restaurants pre-high chair age. BUT we could have got along just fine without it. Fact of the matter is, we needed a 2nd carseat for DH's car, and it was on clearance at Target, so we got it. Now when #2 comes along (whenever that is), all we will need is a 2nd base for my car, and a convertible seat for DS for DH's car.
I love my moby wrap! it is great! though I have seen a brand outthere somewhere that doesn't require any tieing which is the same idea . . . and the Ergo for when baby is around 4 months+, though I am so tempted to get a Boba for when he is a bit bigger.
Muslin blankets (Aiden and Anais is the brand I have) - they work well for swaddling as they are lightweight and huge, light blankets in the summer, and if you NIP and want some discretion for latch on and off, they work well for that too.
I have a stack of flannel receiving blankets that I have never used, ditto crib sheets (still have on the one I put on there when we set up the crib) DS only sleeps in it for naps, mattress protectors, sheet savers, etc.
it is handy to have some sort of portable changing station
bouncy seat I didn't think I'd like, but we have used it a lot, the swing takes up too much space and is never used.
Arm's reach cosleeper we used until about DS's 7 month birthday. then we got a mesh rail for the bed, and he just sleeps with us.
As far as clothes go: we didn't have really any newborn stuff, as we thought DS would be bigger, so we started with 0-3. Turns out, that stuff was too big for nearly a month, so we bought and borrowed newborn things. It doesn't hurt to have a few on hand, if you don't use them, you can pass them down to some one else or consign them.
For you: nursing bras! I love Bravado Designs myself.
as far as the bottles go, you may want them eventually, even if you are a SAHM, it is nice to be able to go out longer than it takes between feedings, by yourself, or with your DH, at some point. That said, if you do SAH, you will want at least a manual pump, unless you are good at manual expression. I WOH 2 days a week, and a pump is a must have. It also helped with engorgement in the first week or so (I was so engorged, my nipples were flat, and the pump relieved the pressure and drew out my nipples enough for DS to latch)
so shortlist:
carseat
carrier
sleeper
clothes
diapers (cloth or sposies)
nursing bras
nursing pads
muslins
pump/bottles
bathwash (no tub, I just used the sink)
nail scissors
wipes (fabric or disposable)
Things you do not need: wipe warmers, baby monitors (though if you are in a big house, or will be on a separate floor from the baby, a video one might be handy), travel system, crib sets (at most you need sheets), I am sure there are tons of others, but it will come to you, once you have the baby, what is actually handy for you to have, and what is not.
for example, swings are lifesavers for many parents, but for us, a waste of space and money. I am glad we bought ours on Craigslist second hand. and the crib. If my dad hadn't built ours as a heirloom type piece, I would chuck it and just put a twin size bed in DS's room. shopping cart/high chair covers nice, but not necessary, and one more thing to lug around. High chairs . . .we don't have a dining table, so this seems pointless, but I can see where it is great for some. etc.