4 year old needs a new carseat

The one she is in right now goes up to 40lbs. I'm not exactly sure how much she weighs but I know it's close to the limit. I think she's around 38-39lbs. Anyways, we need another carseat that goes to higher limit harnessed because I'm not comfortable with her using a booster yet. Does anyone have any suggestions? I think my limit would be $200. I remember wanting the Sunshine Kids Radian80 but I can't find that one anymore.

Sunshine Kids is now Diono you can get it for like $219 on amazon with free shipping  

Graco Nautilus

we have the Graco Nautilus 3-1 which i love. cameron is 4.5 and 40 lbs and fits in it perfectly still.. then when hes old enough i can change it into just a booster

plus its on sale at walmart right now for 129

I have the graco naulitus for my almost three year old and the evenflo smyphony for my 8 month old. Both can be used with a regular seatbelt later on.

I have a 4 year old and I am leaning toward the Sunshine Kids Diano. I saw it on Amazon for $180, I believe.

If your DD is already FF'ing...the Britax Frontier 85 will keep her harnessed longer than any other seat. It's also the tallest High Back Booster on the Market. You can find them all over the web for $209...so barely over your budget, but worth EVERY penny. Our daughter is 5.5yo, 44lbs and 47" she loves her Frontier. It's easy to install [even in the 3rd row of our SUV], 2 cupholders, SIP and a non-rethreading harness...etc.