Please help me decide! DD is approaching the height limits for her Britax infant seat and we need to make the plunge.

We currently have a Maxi Cosi Pria for one vehicle, and I cuss it out each time I use it. No matter how hard I wrench on the straps from the back of the seat, it is so damn hard to tighten. So...that's not an option.

I'm looking at: Britax Advocate Click-Tight, Diono Radian (we would get the angle adjuster), and Chicco Nextfit. We are a tall family, so leg room in the front seat is important, as are the car seat's height limits (would like option to do extended RF). I don't care if the car seat is heavy, it will very rarely be moved.

Tell me your real-life experiences, especially if you have more than one of these! I've read to the end of the car seat blogs.