the adventure buggies are great. You can get them in combinations up to taking two toddlers side by side and two newborns on top! I know that this combo for 2 babes and two toddlers is around $1,4000.
A couple of twin mums with two sets have them and love them!!!
Definately try and stay away from a side by side if you can as they are a bugger getting around
You can get a stroller pram that accomidates two kids limo style- but it is not bigger or wider than a normal stroller pram. Not sure how much they recline, but have seen kiddies asleep in them. It is available in Australia, but its relatively new so you might have to ask around- the people who have them, love them as well.

HTH and good luck
odette