This is my first post here, although I've been doing tons of looking around. Of course I'm thinking about a Radian because it seems popular, but also because I have a Pontiac G6 and I'd like to be able to fit my sisters booster or other people in the back seat! Plus, I like that its low so I won't bonk her head like I do now, and that she would have tons of leg room and not seem squished. But, the thing is, my 11 1/2 month old is very small, still in 3-6 month clothes. Somebody told me a Radian is "overkill" for such a small child, that she could RF in any seat until she is 4 and that I don't need a Radian. So, do you recommend one for me? Or should I just go with something else (Marathon 70?). The only thing worrying me about the Radian is how difficult it is to adjust the harness and whether it will stick up into my front seat since it will be in the middle. I am SO indecisive with big purchases!