I want a back up seat for my youngest. Right now he's in a Combi Shuttle 35. Great seat, but it can only be used baseless to 22 pounds and he has a new cousin coming soon to pass it down to. His main seat is soon to be a Radian RXT and he'll stay RF in it until he outgrows it. Here's what I need...narrow to put in the middle of any average back seat and be able to put an adult on each side, pretty easy to install with a seat belt since most cars don't allow latch in the middle, fairly lightweight so its easy to move around, and rear face to fairly high limits or at least likely to last him RF to three years old. Baby is ten months, 20 pounds, and probably a little over 28 inches. He wears 6-9 months in both pants and onsies, but has an off the charts large head!! Bonus points if the seat doesn't cost an arm and a leg, but give me any options you can think of because I'm drawing a blank here!!