Actually, the most affordable convertible out there, the Cosco Scenera, is one of the most recommended for the little ones!It's what we hand out for newborns through our Safe Kids coalition. If you are interested in getting one of the ones you linked though, the Corroco will probably fit the best in a tight space, but will be outgrown sooner than the Evenflo Triumph Advance or the MyRide. All three of those are great options from birth up, and each has it's own merits. The MyRide rear faces to 40lbs, but it wil be a tough fit in a tight space. The Evenflo Triumph Advance will harness longer than the Scenera, but again, it's a pretty big seat and up on a base. The Corroco is a compact seat, designed for compact cars, but is the most expensive and will be outgrown first by size/weight. The Scenera, will probably harness a similar length to the Corroco, but it is less than half the cost of the Corroco! Again, it will be a tighter fit behind a passenger seat at a 45 degree angle, but better than the MyRide for sure!