I would buy the pram!!! You have also mentioned you may have more babies - worth it to buy the pram now and get more use out of it. I have a capsule and it is such a lifesaver with two or other toddlers. Mine is bigger than the Ambulance hire ones so I have been able to use it for up to 9 months (but my babies are long). It is easy enough to carry around when they are tiny, but by 3 or 4 months it is definitely easier to be able to put it in a pram. Have I convinced you yet?