I would say car seat with adaptors is a must for sleeping baby! It was so handy just clicking DS onto the pram when making quick trips. That is the only thing that has put me off buying a newborn-4 car seat as you can't remove them. A sleeping baby is so precious you will really not want to wake them!
I'm also shopping for a double buggy - DS is nearly 3 so yes I know should be walking around happily but he is SUPER lazy and will only ever walk about 100m before wanting the buggy, he was regularly hospitalized with breathing problems throughout younger years so I don't know if this has something to with him getting tired quickly, but we also do lengthy walks and days out so could not be doing with a stroppy toddler to carry. I love the Baby Jogger City Select double as it can be used as a single pram too but going to buy second hand so I don't lose too much money on it, I don't anticipate needing it for more than a year (I will be forcing DS to walk by then!) Buggy boards I don't think would work either as he likes to relax (I am aware he sounds like a little prince, I suppose he is!)
My sciatica and indigestion are now really getting to me, struggling with moving around and lying down is also very uncomfortable - bought a truck load of Rennies earlier as Gaviscon makes me want to vom!