Well, at 4 I was pretty tall, so I would have to say the Husky, it would probably be the only one that would work for me, and being how light weight I was, I would still need the harness weight wise. Why didn't we have such nice seats when we were kids, lol! I think my youngest brother was in a car seat the longest, and that was an old style one with an overhead shield that probably isn't even legal anymore. I remember all of us in mom's station wagon not sitting properly at all, in the lap belt leaning far enough forward that we could look thru the small rust holes in the floor board and poke things thru them while we were driving. Man, things have changed since then!
~Sarah~