Before deciding on any carrier, consider what you'll use it for most, and consider buying more than one.
Convincing your baby to have a long nap which doesn't constrain you to the couchYour newborn will love snuggling up to you, and you'll enjoy it too, but you'll enjoy it even more if you feel like you can walk around or at least have your arms free.
In particular, stretchy wraps such as the Boba and Moby are awesome for cuddling up with a newborn, especially in winter. Additionally, stretchy wraps are a lot like swaddles, and can help your baby fall asleep. I haven't yet mastered the art of putting baby to sleep as soon as he's tired, and often have to sway, shhh, bounce, etc to get him to sleep, and the stretchy wrap is perfect for that. He often fights it when first put in, but within minutes of walking around in circles, he's out and can sleep for hours, even well beyond his next feeding time if I'm not paying attention.
Soothing your newborn while out on the goMy baby doesn't always take to the carseat well, and can go from asleep to crying in about 3 seconds. As a result, I keep a lightweight easy carrier in my diaper bag at all times. A couple of good options for this are a one-layered simple ring sling (less padding and fabric means it takes up less space) and mei tais without too much extra padding. I currently keep the Sakura Bloom Classic in my diaper bag but am keeping my eyes out for a mei tai I like.
Wearing your baby for long periods of time, even while awakeAs your baby spends more time awake and wants to see more and move around more, you'll want to find a carrier that is extremely comfortable for the both of you, so he learns to enjoy being in it when awake and also so you can wear it for long periods of time without injuring your back.
I've found that for longer period of time, soft structured carriers (SSCs) are very comfortable. Also, my baby prefers being in an SSC while awake compared to a wrap as he's more free to move around and not as stuck to me. A few examples of these are the Ergobaby, Lillebaby Carriers, Beco Gemini, Tula Baby Carrier.