[mrosehughes]

Unless you are planning to rear face, need the thinness of a radian, or have someone else to pass it down to, it makes a lot more sense to get a combination seat than a convertible for a FFing 5yo. I'd get a nauti or britax frontier (or possibly look at the harmony defender). If he's just now outgrowing the chase (which I think has short slots), the nauti will probably buy you plenty of time (although the frontier has the tallest slots and this will last the longest).