I have to second a Sleeping Baby sling. With DS1 I had a Maya RS and a WHAM solarveil RS. Hated them. But this time I just felt like I needed a RS and tried SBP, and LOVE. The shoulder makes all the difference in terms of comfort. I got a new linen, and it was very affordable.
There is a learning curve - I got discouraged at first and thought that I'd end up never using it. But after a few tries, I did get the hang of it, kind of like riding a bike. Once you get it, it is super easy.
An RS is the most adjustable sling you can get. But honestly, don't get any carrier in hopes of the DH using it too. If he is asking for a carrier he can use too, then great. But if you are just hoping he'll wear the baby, then get what you want. My DH could use 3 of the carries I have, and never does, despite him saying "sure, I'll try them". He prefers his arms to any carrier.
As for a pouch... I'm not really a fan. Or rather, my son is not. He's too little to be anything other than reclined in a pouch (I have a Hotsling) and he generally hates that. With an RS, I can have him up on my chest, which he adores. There are just more options with an RS. And pouches must be the correct size, so you cannot share with a different sized person (and if you gain/lose weight you need a new pouch).
Mom to two intact boys, born at home. DS1 11/07, DS2 9/10