Okay deep breath!! In... out... in... out... :LOL :LOL
Okay here's a great source about carseats. It's over at Parentsplace but the ladies there are HIGHLY knowledgeable. http://messageboards.ivillage.com/iv-ppcarseats
They have a couple really good FAQs at the top. I don't see it but there is a link (somewhere on there) were they have a chart on whether or not certain models of carseats with fit into certain cars. BRUs is a good place to "try out" seats too. They usually have a "pretty" good selection of various brands and they will let you take the floor model out to your car and try it out. Can make a big difference of whether of not you can use that seat.
I'm a Britax fan. I just love their safety record and they are really nice. (Definitely shop around for $$ there is no reason to pay full price on a carseat!)
You really want to get an infant seat and then more the baby into a convertible seat at 4-6 months (depending on child's size). Even though the covertible seats SAY they are for newborn and up... all the manufacturerers really recommend getting the infant seat. It's made specifically for their small size.
I'm a little bit of a carseat militant.
I know the cost can seem overwhelming having to buy 2 seats but I just don't think that safety is something you should cut corners on. Drives me insane to see small children in cars without booster seats or carseats.
I fully plan on keeping Tori in some kind of seat for a long time. The seat in a vehicle is designed for an adult not a child, I want her protected as much as possible.
I know we talking about carseats on one of the threads not that long ago.