hi
i also have a mini which i don't really want to give up just yet!
i have a toddler with another on the way.
the only pushchair/travel system i have found that will fit in the boot is the quinny zapp. I am gonna buy the maxi cosi cabrio carseat so it can be used from birth. I am also getting the car fix base thingy as i had that with my graco 3 wheeler system and it was brill as you didn't need to disturb baby when shopping and it gives peace of mind that baby is in the car properly.
hope pregnancy goes well,
daniela