Now that I've settled on getting a Graco Turbo booster or Harmony Literider for my 7 year old DD for our upcoming trip (thanks for the help!), I need to find a travel seat for my 11 month old who weighs 25 lbs. The seat will be used for air travel and taxis, and then in grandparents' car for emergencies. I researched here and thought the Combi Coccoro, Safety First Avenue, and Evenflo Titan Elite offered a good mix of being lightweight and safety features, but don't know if there's something else to consider, and have no idea which would be easiest to haul and install quickly in cabs. Any recommendations? I'm leaving in 2 days so I need to be able to buy it locally. TIA!