Hi, I used slings and wraps so much I never bought a pram or buggy for my daughter, who's 2-3/4 now. And I've been been back carrying her for any naps out and about throughout my pregnancy. Not planning on buying one for this baby either.
I like stretchy wraps for newborns, there are makes (Moby etc) but you can byu 5 metres of interlock jersey (no need to seam) and cut it in two (along the long length and get two wraps (one for the wash). On eBay you can get some quite jazzy fabric -- not the mud/stone/organic goop coloured stuff you often get from sling makers.
I'd then turn to non-stretchy wraps from about 4 months. I have a Didymos and a Girasol (in lovely grey stripes, very classy and not at all like jugglers' trousers) and because I lived in the tropics, a hot weather Calin Bleu gauze one.
I've also used the ergo (my husband's favoured choice for older baby) and then a Boba, which is for 18-24 months onwards, as it has a high back. These are quick to put on an look manly (although some chavs once accosted my husband he's a SAHD and called him a 'gay c*nt' when he was out and about with our daughter. The ergo and boba can be easily used on the back when they get bigger.
They are good for calming, good for getting stuff done without having to put your baby down. You can breastfeed on the move (I've done it in all sorts of places walking about) and getting them to nap. My daughter never napped in a bed, only feeding me or in the wrap.
I've never needed a pram, I get everything in a Longchamps Pliage (the one with the long shoulder drop) and slip whatever coat I like over the top.
You don't have to be a hippy (I'm a designer shallow fashion victim), have back muscles of steel or possess a small poitrine to both enjoy a sling. One friend has taken to them and has bad scoliosis. Really, a good supportive wrap carry is more comfortable than late pregancy, IMO.
The other benefit is that the resell for about as much as you pay. I've seen used Ergos go for 90 quid on eBay when you can buy them for 80.
Babywearer.com is a good site for a trawl and advice. Some on there are fans of lentils and it's US-centric, so some makes you'll have to buy online.
People advise slingmeets too, although I'm frankly scared of that shit!
Avoid Babybjorns. They are about as bad as slings get. Expensive, can only be used for small babies, and they don't offer decent support. And whatever you do don't turn the baby face out. What IS that about!