Take your car to a baby shop and get the to put the various car seats in the back to try them out. It really is worth doing this.
This is what we done. we have a small wagon (pg brain I cann't even remember what 'brand'). and are having a booster (my 3yr DD is bigger then most 4yr olds - 17kg, very tall), a maxi-rider and a s'n's compaq - It is a tight squeeze. If we didn't go with the booster, there were a couple of options available to us - there were generally lesser known brands of car seat, but weren't as bulky.
Personally I upgraded my car, but that was always my plan, I did not want to be fitting 3 carseats into a Daewoo Nubira wagon!! They are too narrow!! and I struggled to get into the middle past the 2 older children so there would be no way I could get past with a baby.
I would recommend using a capsule so that you can put the bigger boys in with as little disturbance to bubs as possible. I would also have bubs on one side so that you can easily get all of them in and out. I also find the capsule a bit narrower than the convertible carseats.
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