I am looking for a new pushchair to use from birth. Will be walking everyday(on various terrain) with it but also don;t want it too heavy as it will be in and out of car too. I have had three wheeler before but am considering 4 wheels this time. It must have reversible seat unit and I don't want a bucket seat - must lie back completely. Probably will use carrycot for first few months. Think that is everything - any ideas?