We used this one up until Sarah's legs were pressing against the backseat. She reached 25 lbs well before her 1st bday so we turned her around. We'll definitely be using this next time around.
http://www.gracobaby.com/catalog/pro...ID=1&subCatID=
Then we upsized:
Highly recommend Britax Marathon. It's more adjustable than most other brands so you won't have to get another as the child grows.
http://www.britaxusa.net/products/detail_marathon.aspx
I like it because it's really easy to toss our 95th percentile, rambunctious 18 month old daughter into the Tblazer. I have an older Graco in my 2door Cavalier econobox and I hate it, the straps are awful and you can never get them untangled. Sarah hates being strapped into it too! Hopefully they've corrected that.
Consumer Reports had to retract a faulty review of childseats, so make sure you look into that as well.
I think you can buy custom racing style covers for any of these too. Maybe someone has a link to that.